21130112031 has 16 divisors (see below), whose sum is σ = 32201205504. Its totient is φ = 12073247424.

The previous prime is 21130112023. The next prime is 21130112041. The reversal of 21130112031 is 13021103112.

It is a happy number.

It is not a de Polignac number, because 21130112031 - 2³ = 21130112023 is a prime.

It is a super-2 number, since 2×21130112031² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21130112031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130112041) 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, 227400 + ... + 306546.

It is an arithmetic number, because the mean of its divisors is an integer number (2012575344).

Almost surely, 2^21130112031 is an apocalyptic number.

21130112031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21130112031 is a deficient number, since it is larger than the sum of its proper divisors (11071093473).

21130112031 is a wasteful number, since it uses less digits than its factorization.

21130112031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91870.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21130112031 its reverse (13021103112), we get a palindrome (34151215143).

The spelling of 21130112031 in words is "twenty-one billion, one hundred thirty million, one hundred twelve thousand, thirty-one".