31201021440020 has 12 divisors (see below), whose sum is σ = 65522145024084. Its totient is φ = 12480408576000.

The previous prime is 31201021439969. The next prime is 31201021440107. The reversal of 31201021440020 is 2004412010213.

It can be written as a sum of positive squares in 2 ways, for example, as 7368151940356 + 23832869499664 = 2714434^2 + 4881892^2 .

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: 1560051072001 = 31201021440020 / (3 + 1 + 2 + 0 + 1 + 0 + 2 + 1 + 4 + 4 + 0 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 31201021439974 and 31201021440001.

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, 780025535981 + ... + 780025536020.

It is an arithmetic number, because the mean of its divisors is an integer number (5460178752007).

Almost surely, 2^{31201021440020} is an apocalyptic number.

It is an amenable number.

31201021440020 is an abundant number, since it is smaller than the sum of its proper divisors (34321123584064).

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

31201021440020 is a wasteful number, since it uses less digits than its factorization.

31201021440020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560051072010 (or 1560051072008 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31201021440020 its reverse (2004412010213), we get a palindrome (33205433450233).

The spelling of 31201021440020 in words is "thirty-one trillion, two hundred one billion, twenty-one million, four hundred forty thousand, twenty".