31012202321212 has 144 divisors (see below), whose sum is σ = 63784433664000. Its totient is φ = 13154469866496.

The previous prime is 31012202321129. The next prime is 31012202321267. The reversal of 31012202321212 is 21212320221013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7510824364 + ... + 7510828492.

It is an arithmetic number, because the mean of its divisors is an integer number (442947456000).

Almost surely, 2^{31012202321212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31012202321212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31892216832000).

31012202321212 is an abundant number, since it is smaller than the sum of its proper divisors (32772231342788).

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

31012202321212 is a wasteful number, since it uses less digits than its factorization.

31012202321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328 (or 5319 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 31012202321212 its reverse (21212320221013), we get a palindrome (52224522542225).

The spelling of 31012202321212 in words is "thirty-one trillion, twelve billion, two hundred two million, three hundred twenty-one thousand, two hundred twelve".