31520421431023 has 8 divisors (see below), whose sum is σ = 38142358706592. Its totient is φ = 25428239137536.

The previous prime is 31520421431021. The next prime is 31520421431053. The reversal of 31520421431023 is 32013412402513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31520421431023 - 2¹ = 31520421431021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31520421431021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132438745390 + ... + 132438745627.

It is an arithmetic number, because the mean of its divisors is an integer number (4767794838324).

Almost surely, 2^{31520421431023} is an apocalyptic number.

31520421431023 is a deficient number, since it is larger than the sum of its proper divisors (6621937275569).

31520421431023 is a wasteful number, since it uses less digits than its factorization.

31520421431023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264877491041.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 31520421431023 its reverse (32013412402513), we get a palindrome (63533833833536).

The spelling of 31520421431023 in words is "thirty-one trillion, five hundred twenty billion, four hundred twenty-one million, four hundred thirty-one thousand, twenty-three".