21011685130 has 16 divisors (see below), whose sum is σ = 37893635784. Its totient is φ = 8388540160.

The previous prime is 21011685113. The next prime is 21011685181. The reversal of 21011685130 is 3158611012.

It can be written as a sum of positive squares in 4 ways, for example, as 19329618961 + 1682066169 = 139031^2 + 41013^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2011267 + ... + 2021686.

Almost surely, 2^21011685130 is an apocalyptic number.

21011685130 is a deficient number, since it is larger than the sum of its proper divisors (16881950654).

21011685130 is a wasteful number, since it uses less digits than its factorization.

21011685130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033481.

The product of its (nonzero) digits is 1440, while the sum is 28.

The spelling of 21011685130 in words is "twenty-one billion, eleven million, six hundred eighty-five thousand, one hundred thirty".