Search a number
-
+
1520300621421 = 3356307430423
BaseRepresentation
bin10110000111111000111…
…110100111111001101101
312101100011100211120001000
4112013320332213321231
5144402033424341141
63122225542310513
7214560316030521
oct26077076477155
95340140746030
101520300621421
1153683508076a
12206789728439
13b0496178b2a
1453823847d81
152982e6e85b6
hex161f8fa7e6d

1520300621421 has 8 divisors (see below), whose sum is σ = 2252297216960. Its totient is φ = 1013533747596.

The previous prime is 1520300621393. The next prime is 1520300621459. The reversal of 1520300621421 is 1241260030251.

1520300621421 is a `hidden beast` number, since 1 + 5 + 2 + 0 + 30 + 0 + 621 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 1520300621421 - 27 = 1520300621293 is a prime.

It is a super-2 number, since 2×15203006214212 (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 56307430423 = 1520300621421 / (1 + 5 + 2 + 0 + 3 + 0 + 0 + 6 + 2 + 1 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520300628421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28153715185 + ... + 28153715238.

It is an arithmetic number, because the mean of its divisors is an integer number (281537152120).

Almost surely, 21520300621421 is an apocalyptic number.

It is an amenable number.

1520300621421 is a deficient number, since it is larger than the sum of its proper divisors (731996595539).

1520300621421 is an equidigital number, since it uses as much as digits as its factorization.

1520300621421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56307430432 (or 56307430426 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 1520300621421 its reverse (1241260030251), we get a palindrome (2761560651672).

The spelling of 1520300621421 in words is "one trillion, five hundred twenty billion, three hundred million, six hundred twenty-one thousand, four hundred twenty-one".

Divisors: 1 3 9 27 56307430423 168922291269 506766873807 1520300621421