21368988910 has 16 divisors (see below), whose sum is σ = 39189920256. Its totient is φ = 8386319968.

The previous prime is 21368988881. The next prime is 21368988929. The reversal of 21368988910 is 1988986312.

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, 20158894 + ... + 20159953.

It is an arithmetic number, because the mean of its divisors is an integer number (2449370016).

Almost surely, 2^21368988910 is an apocalyptic number.

21368988910 is a deficient number, since it is larger than the sum of its proper divisors (17820931346).

21368988910 is a wasteful number, since it uses less digits than its factorization.

21368988910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40318907.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 21368988910 in words is "twenty-one billion, three hundred sixty-eight million, nine hundred eighty-eight thousand, nine hundred ten".