21020839131 has 16 divisors (see below), whose sum is σ = 28509408000. Its totient is φ = 13773191328.

The previous prime is 21020839129. The next prime is 21020839139. The reversal of 21020839131 is 13193802012.

It is not a de Polignac number, because 21020839131 - 2¹ = 21020839129 is a prime.

It is a super-2 number, since 2×21020839131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020839139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944625 + ... + 966621.

It is an arithmetic number, because the mean of its divisors is an integer number (1781838000).

Almost surely, 2^21020839131 is an apocalyptic number.

21020839131 is a deficient number, since it is larger than the sum of its proper divisors (7488568869).

21020839131 is a wasteful number, since it uses less digits than its factorization.

21020839131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27458.

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 21020839131 in words is "twenty-one billion, twenty million, eight hundred thirty-nine thousand, one hundred thirty-one".