31242020203231 has 4 divisors (see below), whose sum is σ = 31242031382232. Its totient is φ = 31242009024232.

The previous prime is 31242020203223. The next prime is 31242020203237. The reversal of 31242020203231 is 13230202024213.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31242020203231 - 2³ = 31242020203223 is a prime.

It is a super-2 number, since 2×31242020203231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31242020203196 and 31242020203205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31242020203237) 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, 2761545 + ... + 8373181.

It is an arithmetic number, because the mean of its divisors is an integer number (7810507845558).

Almost surely, 2^{31242020203231} is an apocalyptic number.

31242020203231 is a deficient number, since it is larger than the sum of its proper divisors (11179001).

31242020203231 is an equidigital number, since it uses as much as digits as its factorization.

31242020203231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11179000.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31242020203231 its reverse (13230202024213), we get a palindrome (44472222227444).

The spelling of 31242020203231 in words is "thirty-one trillion, two hundred forty-two billion, twenty million, two hundred three thousand, two hundred thirty-one".