21457296904 has 64 divisors (see below), whose sum is σ = 43539609600. Its totient is φ = 9881352000.

The previous prime is 21457296901. The next prime is 21457296947. The reversal of 21457296904 is 40969275412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21457296901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1068799 + ... + 1088689.

It is an arithmetic number, because the mean of its divisors is an integer number (680306400).

Almost surely, 2^21457296904 is an apocalyptic number.

It is an amenable number.

21457296904 is an abundant number, since it is smaller than the sum of its proper divisors (22082312696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21457296904 is a wasteful number, since it uses less digits than its factorization.

21457296904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20114 (or 20110 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 21457296904 in words is "twenty-one billion, four hundred fifty-seven million, two hundred ninety-six thousand, nine hundred four".