21319904610 has 48 divisors (see below), whose sum is σ = 56054601720. Its totient is φ = 5621425920.

The previous prime is 21319904597. The next prime is 21319904623. The reversal of 21319904610 is 1640991312.

It is a happy number.

21319904610 is a `hidden beast` number, since 2 + 1 + 3 + 199 + 0 + 461 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21319904597) and next prime (21319904623).

It can be written as a sum of positive squares in 4 ways, for example, as 19701210321 + 1618694289 = 140361^2 + 40233^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1322821 + ... + 1338840.

Almost surely, 2^21319904610 is an apocalyptic number.

21319904610 is an abundant number, since it is smaller than the sum of its proper divisors (34734697110).

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

21319904610 is a wasteful number, since it uses less digits than its factorization.

21319904610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661763 (or 2661760 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The spelling of 21319904610 in words is "twenty-one billion, three hundred nineteen million, nine hundred four thousand, six hundred ten".