21706552110 has 16 divisors (see below), whose sum is σ = 52095725136. Its totient is φ = 5788413888.

The previous prime is 21706552099. The next prime is 21706552159. The reversal of 21706552110 is 1125560712.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 723551737 = 21706552110 / (2 + 1 + 7 + 0 + 6 + 5 + 5 + 2 + 1 + 1 + 0).

It is a congruent number.

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, 361775839 + ... + 361775898.

It is an arithmetic number, because the mean of its divisors is an integer number (3255982821).

Almost surely, 2^21706552110 is an apocalyptic number.

21706552110 is an abundant number, since it is smaller than the sum of its proper divisors (30389173026).

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

21706552110 is a wasteful number, since it uses less digits than its factorization.

21706552110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723551747.

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 21706552110 in words is "twenty-one billion, seven hundred six million, five hundred fifty-two thousand, one hundred ten".