31212102122131 has 4 divisors (see below), whose sum is σ = 35670973853872. Its totient is φ = 26753230390392.

The previous prime is 31212102122129. The next prime is 31212102122231. The reversal of 31212102122131 is 13122120121213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31212102122131 - 2¹ = 31212102122129 is a prime.

It is a super-2 number, since 2×31212102122131² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31212102122231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2229435865860 + ... + 2229435865873.

It is an arithmetic number, because the mean of its divisors is an integer number (8917743463468).

Almost surely, 2^{31212102122131} is an apocalyptic number.

31212102122131 is a deficient number, since it is larger than the sum of its proper divisors (4458871731741).

31212102122131 is an equidigital number, since it uses as much as digits as its factorization.

31212102122131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458871731740.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 31212102122131 its reverse (13122120121213), we get a palindrome (44334222243344).

The spelling of 31212102122131 in words is "thirty-one trillion, two hundred twelve billion, one hundred two million, one hundred twenty-two thousand, one hundred thirty-one".