31303122100220 has 48 divisors (see below), whose sum is σ = 65924578919808. Its totient is φ = 12485482201920.

The previous prime is 31303122100219. The next prime is 31303122100259. The reversal of 31303122100220 is 2200122130313.

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 = 31303122100192 and 31303122100201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9149339 + ... + 12096141.

It is an arithmetic number, because the mean of its divisors is an integer number (1373428727496).

Almost surely, 2^{31303122100220} is an apocalyptic number.

It is an amenable number.

31303122100220 is an abundant number, since it is smaller than the sum of its proper divisors (34621456819588).

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

31303122100220 is a wasteful number, since it uses less digits than its factorization.

31303122100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948330 (or 2948328 counting only the distinct ones).

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

Adding to 31303122100220 its reverse (2200122130313), we get a palindrome (33503244230533).

The spelling of 31303122100220 in words is "thirty-one trillion, three hundred three billion, one hundred twenty-two million, one hundred thousand, two hundred twenty".