231545443431021 has 8 divisors (see below), whose sum is σ = 316257191027904. Its totient is φ = 150598662394080.

The previous prime is 231545443430999. The next prime is 231545443431023. The reversal of 231545443431021 is 120134344545132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231545443431021 - 2⁵ = 231545443430989 is a prime.

It is a super-2 number, since 2×231545443431021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231545443431023) 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, 941241639841 + ... + 941241640086.

It is an arithmetic number, because the mean of its divisors is an integer number (39532148878488).

Almost surely, 2^{231545443431021} is an apocalyptic number.

It is an amenable number.

231545443431021 is a deficient number, since it is larger than the sum of its proper divisors (84711747596883).

231545443431021 is a wasteful number, since it uses less digits than its factorization.

231545443431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882483279971.

The product of its (nonzero) digits is 691200, while the sum is 42.

Adding to 231545443431021 its reverse (120134344545132), we get a palindrome (351679787976153).

The spelling of 231545443431021 in words is "two hundred thirty-one trillion, five hundred forty-five billion, four hundred forty-three million, four hundred thirty-one thousand, twenty-one".