21679970910 has 64 divisors (see below), whose sum is σ = 57337555968. Its totient is φ = 5212497024.

The previous prime is 21679970909. The next prime is 21679970929. The reversal of 21679970910 is 1907997612.

It is a happy number.

It is a super-2 number, since 2×21679970910² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 629622 + ... + 663161.

It is an arithmetic number, because the mean of its divisors is an integer number (895899312).

Almost surely, 2^21679970910 is an apocalyptic number.

21679970910 is an abundant number, since it is smaller than the sum of its proper divisors (35657585058).

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

21679970910 is a wasteful number, since it uses less digits than its factorization.

21679970910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292849.

The product of its (nonzero) digits is 428652, while the sum is 51.

The spelling of 21679970910 in words is "twenty-one billion, six hundred seventy-nine million, nine hundred seventy thousand, nine hundred ten".