21045693936 has 80 divisors (see below), whose sum is σ = 57165046560. Its totient is φ = 6662261760.

The previous prime is 21045693913. The next prime is 21045693953. The reversal of 21045693936 is 63939654012.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39015 + ... + 208838.

It is an arithmetic number, because the mean of its divisors is an integer number (714563082).

Almost surely, 2^21045693936 is an apocalyptic number.

It is an amenable number.

21045693936 is an abundant number, since it is smaller than the sum of its proper divisors (36119352624).

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

21045693936 is a wasteful number, since it uses less digits than its factorization.

21045693936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247954 (or 247948 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 48.

The spelling of 21045693936 in words is "twenty-one billion, forty-five million, six hundred ninety-three thousand, nine hundred thirty-six".