21706735652 has 24 divisors (see below), whose sum is σ = 43522847424. Its totient is φ = 9279448992.

The previous prime is 21706735627. The next prime is 21706735663. The reversal of 21706735652 is 25653760712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965258 + ... + 987489.

It is an arithmetic number, because the mean of its divisors is an integer number (1813451976).

Almost surely, 2^21706735652 is an apocalyptic number.

It is an amenable number.

21706735652 is an abundant number, since it is smaller than the sum of its proper divisors (21816111772).

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

21706735652 is a wasteful number, since it uses less digits than its factorization.

21706735652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953155 (or 1953153 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 21706735652 in words is "twenty-one billion, seven hundred six million, seven hundred thirty-five thousand, six hundred fifty-two".