31312231011021 has 8 divisors (see below), whose sum is σ = 41990968755360. Its totient is φ = 20754156970352.

The previous prime is 31312231011013. The next prime is 31312231011053. The reversal of 31312231011021 is 12011013221313.

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 31312231011021 - 2³ = 31312231011013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312231011071) 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, 30165925311 + ... + 30165926348.

It is an arithmetic number, because the mean of its divisors is an integer number (5248871094420).

Almost surely, 2^{31312231011021} is an apocalyptic number.

It is an amenable number.

31312231011021 is a deficient number, since it is larger than the sum of its proper divisors (10678737744339).

31312231011021 is a wasteful number, since it uses less digits than its factorization.

31312231011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60331851835.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31312231011021 its reverse (12011013221313), we get a palindrome (43323244232334).

The spelling of 31312231011021 in words is "thirty-one trillion, three hundred twelve billion, two hundred thirty-one million, eleven thousand, twenty-one".