31521020244312 has 64 divisors (see below), whose sum is σ = 80095646764800. Its totient is φ = 10334599309440.

The previous prime is 31521020244281. The next prime is 31521020244401. The reversal of 31521020244312 is 21344202012513.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31521020244312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125818389 + ... + 126068667.

It is an arithmetic number, because the mean of its divisors is an integer number (1251494480700).

Almost surely, 2^{31521020244312} is an apocalyptic number.

It is an amenable number.

31521020244312 is an abundant number, since it is smaller than the sum of its proper divisors (48574626520488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31521020244312 is a wasteful number, since it uses less digits than its factorization.

31521020244312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336376 (or 336372 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 31521020244312 its reverse (21344202012513), we get a palindrome (52865222256825).

The spelling of 31521020244312 in words is "thirty-one trillion, five hundred twenty-one billion, twenty million, two hundred forty-four thousand, three hundred twelve".