31212102330021 has 16 divisors (see below), whose sum is σ = 44559247219200. Its totient is φ = 19364018539008.

The previous prime is 31212102330007. The next prime is 31212102330077. The reversal of 31212102330021 is 12003320121213.

It is not a de Polignac number, because 31212102330021 - 2¹⁸ = 31212102067877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31212102330021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212102330001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3438208981 + ... + 3438218058.

It is an arithmetic number, because the mean of its divisors is an integer number (2784952951200).

Almost surely, 2^{31212102330021} is an apocalyptic number.

It is an amenable number.

31212102330021 is a deficient number, since it is larger than the sum of its proper divisors (13347144889179).

31212102330021 is a wasteful number, since it uses less digits than its factorization.

31212102330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876427148.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31212102330021 its reverse (12003320121213), we get a palindrome (43215422451234).

The spelling of 31212102330021 in words is "thirty-one trillion, two hundred twelve billion, one hundred two million, three hundred thirty thousand, twenty-one".