31201011220 has 24 divisors (see below), whose sum is σ = 65529072000. Its totient is φ = 12479080992.

The previous prime is 31201011197. The next prime is 31201011269. The reversal of 31201011220 is 2211010213.

It is a self number, because there is not a number n which added to its sum of digits gives 31201011220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123081 + ... + 278479.

It is an arithmetic number, because the mean of its divisors is an integer number (2730378000).

Almost surely, 2^31201011220 is an apocalyptic number.

It is an amenable number.

31201011220 is an abundant number, since it is smaller than the sum of its proper divisors (34328060780).

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

31201011220 is a wasteful number, since it uses less digits than its factorization.

31201011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165447 (or 165445 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31201011220 its reverse (2211010213), we get a palindrome (33412021433).

The spelling of 31201011220 in words is "thirty-one billion, two hundred one million, eleven thousand, two hundred twenty".