21507379610 has 16 divisors (see below), whose sum is σ = 39759588936. Its totient is φ = 8370439488.

The previous prime is 21507379601. The next prime is 21507379637. The reversal of 21507379610 is 1697370512.

It can be written as a sum of positive squares in 4 ways, for example, as 15199684369 + 6307695241 = 123287^2 + 79421^2 .

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, 29063657 + ... + 29064396.

Almost surely, 2^21507379610 is an apocalyptic number.

21507379610 is a deficient number, since it is larger than the sum of its proper divisors (18252209326).

21507379610 is a wasteful number, since it uses less digits than its factorization.

21507379610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58128097.

The product of its (nonzero) digits is 79380, while the sum is 41.

The spelling of 21507379610 in words is "twenty-one billion, five hundred seven million, three hundred seventy-nine thousand, six hundred ten".