231132223021 has 4 divisors (see below), whose sum is σ = 264151112032. Its totient is φ = 198113334012.

The previous prime is 231132222983. The next prime is 231132223027. The reversal of 231132223021 is 120322231132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231132223021 - 2³⁵ = 196772484653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231132222983 and 231132223001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231132223027) 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, 16509444495 + ... + 16509444508.

It is an arithmetic number, because the mean of its divisors is an integer number (66037778008).

Almost surely, 2^231132223021 is an apocalyptic number.

It is an amenable number.

231132223021 is a deficient number, since it is larger than the sum of its proper divisors (33018889011).

231132223021 is an equidigital number, since it uses as much as digits as its factorization.

231132223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33018889010.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 231132223021 its reverse (120322231132), we get a palindrome (351454454153).

The spelling of 231132223021 in words is "two hundred thirty-one billion, one hundred thirty-two million, two hundred twenty-three thousand, twenty-one".