31001200220 has 24 divisors (see below), whose sum is σ = 65216559408. Its totient is φ = 12378758400.

The previous prime is 31001200213. The next prime is 31001200231. The reversal of 31001200220 is 2200210013.

It is a happy number.

It is a super-2 number, since 2×31001200220² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1345901 + ... + 1368740.

It is an arithmetic number, because the mean of its divisors is an integer number (2717356642).

Almost surely, 2^31001200220 is an apocalyptic number.

It is an amenable number.

31001200220 is an abundant number, since it is smaller than the sum of its proper divisors (34215359188).

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

31001200220 is a wasteful number, since it uses less digits than its factorization.

31001200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715221 (or 2715219 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 31001200220 its reverse (2200210013), we get a palindrome (33201410233).

The spelling of 31001200220 in words is "thirty-one billion, one million, two hundred thousand, two hundred twenty".