31212103200220 has 24 divisors (see below), whose sum is σ = 65548253068704. Its totient is φ = 12484301023296.

The previous prime is 31212103200211. The next prime is 31212103200247. The reversal of 31212103200220 is 2200230121213.

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 7 ways as a sum of consecutive naturals, for example, 33292152 + ... + 34216831.

It is an arithmetic number, because the mean of its divisors is an integer number (2731177211196).

Almost surely, 2^{31212103200220} is an apocalyptic number.

It is an amenable number.

31212103200220 is an abundant number, since it is smaller than the sum of its proper divisors (34336149868484).

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

31212103200220 is a wasteful number, since it uses less digits than its factorization.

31212103200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67532109 (or 67532107 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31212103200220 its reverse (2200230121213), we get a palindrome (33412333321433).

The spelling of 31212103200220 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, two hundred thousand, two hundred twenty".