31313202100220 has 12 divisors (see below), whose sum is σ = 65757724410504. Its totient is φ = 12525280840080.

The previous prime is 31313202100181. The next prime is 31313202100241. The reversal of 31313202100220 is 2200120231313.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1565660105011 = 31313202100220 / (3 + 1 + 3 + 1 + 3 + 2 + 0 + 2 + 1 + 0 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 31313202100192 and 31313202100201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782830052486 + ... + 782830052525.

It is an arithmetic number, because the mean of its divisors is an integer number (5479810367542).

Almost surely, 2^{31313202100220} is an apocalyptic number.

It is an amenable number.

31313202100220 is an abundant number, since it is smaller than the sum of its proper divisors (34444522310284).

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

31313202100220 is a wasteful number, since it uses less digits than its factorization.

31313202100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565660105020 (or 1565660105018 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31313202100220 its reverse (2200120231313), we get a palindrome (33513322331533).

The spelling of 31313202100220 in words is "thirty-one trillion, three hundred thirteen billion, two hundred two million, one hundred thousand, two hundred twenty".