Search a number
-
+
21123211301 = 43149009771
BaseRepresentation
bin10011101011000010…
…101010000000100101
32000112010001022111022
4103223002222000211
5321230020230201
613412011420525
71345311222263
oct235302520045
960463038438
1021123211301
118a5a558325
124116154745
131cb82c45ca
141045547433
1583968941b
hex4eb0aa025

21123211301 has 4 divisors (see below), whose sum is σ = 21172221504. Its totient is φ = 21074201100.

The previous prime is 21123211267. The next prime is 21123211379. The reversal of 21123211301 is 10311232112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21123211301 is a prime.

It is a super-2 number, since 2×211232113012 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21123211301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123211381) 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, 24504455 + ... + 24505316.

It is an arithmetic number, because the mean of its divisors is an integer number (5293055376).

Almost surely, 221123211301 is an apocalyptic number.

It is an amenable number.

21123211301 is a deficient number, since it is larger than the sum of its proper divisors (49010203).

21123211301 is an equidigital number, since it uses as much as digits as its factorization.

21123211301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49010202.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21123211301 its reverse (10311232112), we get a palindrome (31434443413).

The spelling of 21123211301 in words is "twenty-one billion, one hundred twenty-three million, two hundred eleven thousand, three hundred one".

Divisors: 1 431 49009771 21123211301