231244432021 has 4 divisors (see below), whose sum is σ = 231449255500. Its totient is φ = 231039608544.

The previous prime is 231244431989. The next prime is 231244432031. The reversal of 231244432021 is 120234442132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 70098387121 + 161146044900 = 264761^2 + 401430^2 .

It is a cyclic number.

It is not a de Polignac number, because 231244432021 - 2⁵ = 231244431989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231244432031) 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, 102410046 + ... + 102412303.

It is an arithmetic number, because the mean of its divisors is an integer number (57862313875).

Almost surely, 2^231244432021 is an apocalyptic number.

It is an amenable number.

231244432021 is a deficient number, since it is larger than the sum of its proper divisors (204823479).

231244432021 is a wasteful number, since it uses less digits than its factorization.

231244432021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204823478.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 231244432021 its reverse (120234442132), we get a palindrome (351478874153).

The spelling of 231244432021 in words is "two hundred thirty-one billion, two hundred forty-four million, four hundred thirty-two thousand, twenty-one".