31220443223420 has 48 divisors (see below), whose sum is σ = 71525817847008. Its totient is φ = 11352472469760.

The previous prime is 31220443223393. The next prime is 31220443223447. The reversal of 31220443223420 is 2432234402213.

It is an interprime number because it is at equal distance from previous prime (31220443223393) and next prime (31220443223447).

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, 3450014 + ... + 8622266.

It is an arithmetic number, because the mean of its divisors is an integer number (1490121205146).

Almost surely, 2^{31220443223420} is an apocalyptic number.

It is an amenable number.

31220443223420 is an abundant number, since it is smaller than the sum of its proper divisors (40305374623588).

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

31220443223420 is a wasteful number, since it uses less digits than its factorization.

31220443223420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5199710 (or 5199708 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 31220443223420 its reverse (2432234402213), we get a palindrome (33652677625633).

The spelling of 31220443223420 in words is "thirty-one trillion, two hundred twenty billion, four hundred forty-three million, two hundred twenty-three thousand, four hundred twenty".