31212102120202 has 16 divisors (see below), whose sum is σ = 46987631407080. Its totient is φ = 15549559420608.

The previous prime is 31212102120109. The next prime is 31212102120209. The reversal of 31212102120202 is 20202120121213.

It can be written as a sum of positive squares in 4 ways, for example, as 23631061270041 + 7581040850161 = 4861179^2 + 2753369^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31212102120202.

It is not an unprimeable number, because it can be changed into a prime (31212102120209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74908548 + ... + 75324064.

Almost surely, 2^{31212102120202} is an apocalyptic number.

31212102120202 is a deficient number, since it is larger than the sum of its proper divisors (15775529286878).

31212102120202 is a wasteful number, since it uses less digits than its factorization.

31212102120202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551385.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 31212102120202 its reverse (20202120121213), we get a palindrome (51414222241415).

The spelling of 31212102120202 in words is "thirty-one trillion, two hundred twelve billion, one hundred two million, one hundred twenty thousand, two hundred two".