31220320213025 has 12 divisors (see below), whose sum is σ = 38796094716912. Its totient is φ = 24922773813840.

The previous prime is 31220320213009. The next prime is 31220320213039. The reversal of 31220320213025 is 52031202302213.

It is not a de Polignac number, because 31220320213025 - 2⁴ = 31220320213009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220320212985 and 31220320213003.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1337047007 + ... + 1337070356.

It is an arithmetic number, because the mean of its divisors is an integer number (3233007893076).

Almost surely, 2^{31220320213025} is an apocalyptic number.

It is an amenable number.

31220320213025 is a deficient number, since it is larger than the sum of its proper divisors (7575774503887).

31220320213025 is a wasteful number, since it uses less digits than its factorization.

31220320213025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674117840 (or 2674117835 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 31220320213025 its reverse (52031202302213), we get a palindrome (83251522515238).

The spelling of 31220320213025 in words is "thirty-one trillion, two hundred twenty billion, three hundred twenty million, two hundred thirteen thousand, twenty-five".