31205542213012 has 12 divisors (see below), whose sum is σ = 54850270235040. Its totient is φ = 15534036431576.

The previous prime is 31205542212979. The next prime is 31205542213093. The reversal of 31205542213012 is 21031224550213.

It is a happy number.

It is a super-2 number, since 2×31205542213012² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17183667712 + ... + 17183669527.

It is an arithmetic number, because the mean of its divisors is an integer number (4570855852920).

Almost surely, 2^{31205542213012} is an apocalyptic number.

It is an amenable number.

31205542213012 is a deficient number, since it is larger than the sum of its proper divisors (23644728022028).

31205542213012 is a wasteful number, since it uses less digits than its factorization.

31205542213012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34367337470 (or 34367337468 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 31205542213012 its reverse (21031224550213), we get a palindrome (52236766763225).

The spelling of 31205542213012 in words is "thirty-one trillion, two hundred five billion, five hundred forty-two million, two hundred thirteen thousand, twelve".