21130112131 has 8 divisors (see below), whose sum is σ = 21457236528. Its totient is φ = 20805300000.

The previous prime is 21130112119. The next prime is 21130112161. The reversal of 21130112131 is 13121103112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21130112131 - 2⁹ = 21130111619 is a prime.

It is a super-2 number, since 2×21130112131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130112161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559645 + ... + 596206.

It is an arithmetic number, because the mean of its divisors is an integer number (2682154566).

Almost surely, 2^21130112131 is an apocalyptic number.

21130112131 is a deficient number, since it is larger than the sum of its proper divisors (327124397).

21130112131 is a wasteful number, since it uses less digits than its factorization.

21130112131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156133.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21130112131 its reverse (13121103112), we get a palindrome (34251215243).

The spelling of 21130112131 in words is "twenty-one billion, one hundred thirty million, one hundred twelve thousand, one hundred thirty-one".