31212012131 has 8 divisors (see below), whose sum is σ = 32416518144. Its totient is φ = 30019860360.

The previous prime is 31212012107. The next prime is 31212012151. The reversal of 31212012131 is 13121021213.

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 31212012131 - 2¹⁰ = 31212011107 is a prime.

It is a super-2 number, since 2×31212012131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212012151) 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, 3083411 + ... + 3093516.

It is an arithmetic number, because the mean of its divisors is an integer number (4052064768).

Almost surely, 2^31212012131 is an apocalyptic number.

31212012131 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31212012131 is a deficient number, since it is larger than the sum of its proper divisors (1204506013).

31212012131 is a wasteful number, since it uses less digits than its factorization.

31212012131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6177121.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31212012131 its reverse (13121021213), we get a palindrome (44333033344).

The spelling of 31212012131 in words is "thirty-one billion, two hundred twelve million, twelve thousand, one hundred thirty-one".