21073645704 has 64 divisors (see below), whose sum is σ = 54716169600. Its totient is φ = 6757876224.

The previous prime is 21073645699. The next prime is 21073645753. The reversal of 21073645704 is 40754637012.

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, 54292 + ... + 212355.

It is an arithmetic number, because the mean of its divisors is an integer number (854940150).

Almost surely, 2^21073645704 is an apocalyptic number.

21073645704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21073645704 is an abundant number, since it is smaller than the sum of its proper divisors (33642523896).

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

21073645704 is a wasteful number, since it uses less digits than its factorization.

21073645704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266782 (or 266778 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 39.

The spelling of 21073645704 in words is "twenty-one billion, seventy-three million, six hundred forty-five thousand, seven hundred four".