21121710704 has 20 divisors (see below), whose sum is σ = 42702589776. Its totient is φ = 10101687552.

The previous prime is 21121710703. The next prime is 21121710761. The reversal of 21121710704 is 40701712112.

It is a super-2 number, since 2×21121710704² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121710703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28697609 + ... + 28698344.

Almost surely, 2^21121710704 is an apocalyptic number.

It is an amenable number.

21121710704 is an abundant number, since it is smaller than the sum of its proper divisors (21580879072).

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

21121710704 is a wasteful number, since it uses less digits than its factorization.

21121710704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57395984 (or 57395978 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The spelling of 21121710704 in words is "twenty-one billion, one hundred twenty-one million, seven hundred ten thousand, seven hundred four".