21020130131 has 32 divisors (see below), whose sum is σ = 29883022848. Its totient is φ = 14229987840.

The previous prime is 21020130101. The next prime is 21020130149. The reversal of 21020130131 is 13103102012.

It is a cyclic number.

It is not a de Polignac number, because 21020130131 - 2³⁰ = 19946388307 is a prime.

It is a super-2 number, since 2×21020130131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020130101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 600605 + ... + 634638.

It is an arithmetic number, because the mean of its divisors is an integer number (933844464).

Almost surely, 2^21020130131 is an apocalyptic number.

21020130131 is a deficient number, since it is larger than the sum of its proper divisors (8862892717).

21020130131 is a wasteful number, since it uses less digits than its factorization.

21020130131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235291.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21020130131 its reverse (13103102012), we get a palindrome (34123232143).

It can be divided in two parts, 21020 and 130131, that added together give a palindrome (151151).

The spelling of 21020130131 in words is "twenty-one billion, twenty million, one hundred thirty thousand, one hundred thirty-one".