31000213213012 has 24 divisors (see below), whose sum is σ = 54535764799656. Its totient is φ = 15418730692608.

The previous prime is 31000213212959. The next prime is 31000213213117. The reversal of 31000213213012 is 21031231200013.

It can be written as a sum of positive squares in 4 ways, for example, as 30195970147396 + 804243065616 = 5495086^2 + 896796^2 .

It is a super-2 number, since 2×31000213213012² (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 7 ways as a sum of consecutive naturals, for example, 19816633 + ... + 21323680.

It is an arithmetic number, because the mean of its divisors is an integer number (2272323533319).

Almost surely, 2^{31000213213012} is an apocalyptic number.

It is an amenable number.

31000213213012 is a deficient number, since it is larger than the sum of its proper divisors (23535551586644).

31000213213012 is a wasteful number, since it uses less digits than its factorization.

31000213213012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41141307 (or 41141305 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31000213213012 its reverse (21031231200013), we get a palindrome (52031444413025).

The spelling of 31000213213012 in words is "thirty-one trillion, two hundred thirteen million, two hundred thirteen thousand, twelve".