31201001220 has 24 divisors (see below), whose sum is σ = 87362803584. Its totient is φ = 8320266976.

The previous prime is 31201001219. The next prime is 31201001239. The reversal of 31201001220 is 2210010213.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31201001196 and 31201001205.

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, 260008284 + ... + 260008403.

It is an arithmetic number, because the mean of its divisors is an integer number (3640116816).

Almost surely, 2^31201001220 is an apocalyptic number.

31201001220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31201001220 is an abundant number, since it is smaller than the sum of its proper divisors (56161802364).

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

31201001220 is a wasteful number, since it uses less digits than its factorization.

31201001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520016699 (or 520016697 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 31201001220 its reverse (2210010213), we get a palindrome (33411011433).

The spelling of 31201001220 in words is "thirty-one billion, two hundred one million, one thousand, two hundred twenty".