Search a number
-
+
21312201013 = 33136432901
BaseRepresentation
bin10011110110010011…
…100110000100110101
32001000021122222122021
4103312103212010311
5322121410413023
613442442233141
71353064501555
oct236623460465
961007588567
1021312201013
119047200074
1241694b57b1
1320184c523c
1410626a1165
1584b06b35d
hex4f64e6135

21312201013 has 4 divisors (see below), whose sum is σ = 21318637228. Its totient is φ = 21305764800.

The previous prime is 21312200999. The next prime is 21312201017. The reversal of 21312201013 is 31010221312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16754195844 + 4558005169 = 129438^2 + 67513^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21312201013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312201017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3213138 + ... + 3219763.

It is an arithmetic number, because the mean of its divisors is an integer number (5329659307).

Almost surely, 221312201013 is an apocalyptic number.

It is an amenable number.

21312201013 is a deficient number, since it is larger than the sum of its proper divisors (6436215).

21312201013 is an equidigital number, since it uses as much as digits as its factorization.

21312201013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6436214.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21312201013 its reverse (31010221312), we get a palindrome (52322422325).

The spelling of 21312201013 in words is "twenty-one billion, three hundred twelve million, two hundred one thousand, thirteen".

Divisors: 1 3313 6432901 21312201013