21045696936 has 32 divisors (see below), whose sum is σ = 57397356000. Its totient is φ = 6377483840.

The previous prime is 21045696899. The next prime is 21045696943. The reversal of 21045696936 is 63969654012.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39859011 + ... + 39859538.

It is an arithmetic number, because the mean of its divisors is an integer number (1793667375).

Almost surely, 2^21045696936 is an apocalyptic number.

It is an amenable number.

21045696936 is an abundant number, since it is smaller than the sum of its proper divisors (36351659064).

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

21045696936 is a wasteful number, since it uses less digits than its factorization.

21045696936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79718569 (or 79718565 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 51.

The spelling of 21045696936 in words is "twenty-one billion, forty-five million, six hundred ninety-six thousand, nine hundred thirty-six".