31212103310231 has 32 divisors (see below), whose sum is σ = 32729177779200. Its totient is φ = 29739735043200.

The previous prime is 31212103310209. The next prime is 31212103310237. The reversal of 31212103310231 is 13201330121213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212103310231 is a prime.

It is a super-2 number, since 2×31212103310231² (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 = 31212103310197 and 31212103310206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212103310237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 658195640 + ... + 658243058.

It is an arithmetic number, because the mean of its divisors is an integer number (1022786805600).

Almost surely, 2^{31212103310231} is an apocalyptic number.

31212103310231 is a deficient number, since it is larger than the sum of its proper divisors (1517074468969).

31212103310231 is a wasteful number, since it uses less digits than its factorization.

31212103310231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49559.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31212103310231 its reverse (13201330121213), we get a palindrome (44413433431444).

The spelling of 31212103310231 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, three hundred ten thousand, two hundred thirty-one".