21105046264 has 32 divisors (see below), whose sum is σ = 42257059200. Its totient is φ = 9859973760.

The previous prime is 21105046243. The next prime is 21105046267. The reversal of 21105046264 is 46264050112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105046267) 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, 1460067 + ... + 1474450.

It is an arithmetic number, because the mean of its divisors is an integer number (1320533100).

Almost surely, 2^21105046264 is an apocalyptic number.

It is an amenable number.

21105046264 is an abundant number, since it is smaller than the sum of its proper divisors (21152012936).

21105046264 is a wasteful number, since it uses less digits than its factorization.

21105046264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934583 (or 2934579 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 21105046264 its reverse (46264050112), we get a palindrome (67369096376).

The spelling of 21105046264 in words is "twenty-one billion, one hundred five million, forty-six thousand, two hundred sixty-four".