31520420504403 has 16 divisors (see below), whose sum is σ = 42033325248000. Its totient is φ = 21010564994720.

The previous prime is 31520420504359. The next prime is 31520420504423. The reversal of 31520420504403 is 30440502402513.

It is a cyclic number.

It is not a de Polignac number, because 31520420504403 - 2⁸ = 31520420504147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31520420504423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911267233 + ... + 911301821.

It is an arithmetic number, because the mean of its divisors is an integer number (2627082828000).

Almost surely, 2^{31520420504403} is an apocalyptic number.

31520420504403 is a deficient number, since it is larger than the sum of its proper divisors (10512904743597).

31520420504403 is a wasteful number, since it uses less digits than its factorization.

31520420504403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69882.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 31520420504403 its reverse (30440502402513), we get a palindrome (61960922906916).

The spelling of 31520420504403 in words is "thirty-one trillion, five hundred twenty billion, four hundred twenty million, five hundred four thousand, four hundred three".