21013231111131 has 32 divisors (see below), whose sum is σ = 32244376435200. Its totient is φ = 11923526681856.

The previous prime is 21013231111121. The next prime is 21013231111141. The reversal of 21013231111131 is 13111113231012.

It is an interprime number because it is at equal distance from previous prime (21013231111121) and next prime (21013231111141).

It is not a de Polignac number, because 21013231111131 - 2⁵ = 21013231111099 is a prime.

It is a super-2 number, since 2×21013231111131² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21013231111098 and 21013231111107.

It is not an unprimeable number, because it can be changed into a prime (21013231111121) 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, 9879735 + ... + 11816751.

It is an arithmetic number, because the mean of its divisors is an integer number (1007636763600).

Almost surely, 2^{21013231111131} is an apocalyptic number.

21013231111131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21013231111131 is a deficient number, since it is larger than the sum of its proper divisors (11231145324069).

21013231111131 is a wasteful number, since it uses less digits than its factorization.

21013231111131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940643.

The product of its (nonzero) digits is 108, while the sum is 21.

Adding to 21013231111131 its reverse (13111113231012), we get a palindrome (34124344342143).

The spelling of 21013231111131 in words is "twenty-one trillion, thirteen billion, two hundred thirty-one million, one hundred eleven thousand, one hundred thirty-one".