31212103122131 has 4 divisors (see below), whose sum is σ = 31213202439192. Its totient is φ = 31211003805072.

The previous prime is 31212103122103. The next prime is 31212103122149. The reversal of 31212103122131 is 13122130121213.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212103122131 is a prime.

It is a super-2 number, since 2×31212103122131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212103122097 and 31212103122106.

It is not an unprimeable number, because it can be changed into a prime (31212103124131) 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, 549615941 + ... + 549672726.

It is an arithmetic number, because the mean of its divisors is an integer number (7803300609798).

Almost surely, 2^{31212103122131} is an apocalyptic number.

31212103122131 is a deficient number, since it is larger than the sum of its proper divisors (1099317061).

31212103122131 is a wasteful number, since it uses less digits than its factorization.

31212103122131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099317060.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31212103122131 its reverse (13122130121213), we get a palindrome (44334233243344).

The spelling of 31212103122131 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred twenty-two thousand, one hundred thirty-one".