31212113200220 has 24 divisors (see below), whose sum is σ = 66016987638000. Its totient is φ = 12395026248192.

The previous prime is 31212113200199. The next prime is 31212113200237. The reversal of 31212113200220 is 2200231121213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31212113200192 and 31212113200201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5613686645 + ... + 5613692204.

It is an arithmetic number, because the mean of its divisors is an integer number (2750707818250).

Almost surely, 2^{31212113200220} is an apocalyptic number.

It is an amenable number.

31212113200220 is an abundant number, since it is smaller than the sum of its proper divisors (34804874437780).

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

31212113200220 is a wasteful number, since it uses less digits than its factorization.

31212113200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11227378997 (or 11227378995 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31212113200220 its reverse (2200231121213), we get a palindrome (33412344321433).

The spelling of 31212113200220 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, two hundred thousand, two hundred twenty".