21951436910 has 64 divisors (see below), whose sum is σ = 43352064000. Its totient is φ = 7954008192.

The previous prime is 21951436909. The next prime is 21951436931. The reversal of 21951436910 is 1963415912.

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, 1708691 + ... + 1721489.

It is an arithmetic number, because the mean of its divisors is an integer number (677376000).

Almost surely, 2^21951436910 is an apocalyptic number.

21951436910 is a deficient number, since it is larger than the sum of its proper divisors (21400627090).

21951436910 is a wasteful number, since it uses less digits than its factorization.

21951436910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13065.

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 21951436910 in words is "twenty-one billion, nine hundred fifty-one million, four hundred thirty-six thousand, nine hundred ten".