20031021331231 has 4 divisors (see below), whose sum is σ = 20064462102000. Its totient is φ = 19997580560464.

The previous prime is 20031021331207. The next prime is 20031021331241. The reversal of 20031021331231 is 13213312013002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20031021331231 - 2⁷ = 20031021331103 is a prime.

It is a super-2 number, since 2×20031021331231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031021331201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16720384486 + ... + 16720385683.

It is an arithmetic number, because the mean of its divisors is an integer number (5016115525500).

Almost surely, 2^{20031021331231} is an apocalyptic number.

20031021331231 is a deficient number, since it is larger than the sum of its proper divisors (33440770769).

20031021331231 is an equidigital number, since it uses as much as digits as its factorization.

20031021331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33440770768.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 20031021331231 its reverse (13213312013002), we get a palindrome (33244333344233).

It can be divided in two parts, 2003102 and 1331231, that added together give a palindrome (3334333).

The spelling of 20031021331231 in words is "twenty trillion, thirty-one billion, twenty-one million, three hundred thirty-one thousand, two hundred thirty-one".