231230031120021 has 16 divisors (see below), whose sum is σ = 312532597051136. Its totient is φ = 152040443544576.

The previous prime is 231230031120019. The next prime is 231230031120073. The reversal of 231230031120021 is 120021130032132.

It is not a de Polignac number, because 231230031120021 - 2¹ = 231230031120019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231230031120021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231230031120521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23513316 + ... + 31864338.

It is an arithmetic number, because the mean of its divisors is an integer number (19533287315696).

Almost surely, 2^{231230031120021} is an apocalyptic number.

It is an amenable number.

231230031120021 is a deficient number, since it is larger than the sum of its proper divisors (81302565931115).

231230031120021 is a wasteful number, since it uses less digits than its factorization.

231230031120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8477532.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 231230031120021 its reverse (120021130032132), we get a palindrome (351251161152153).

The spelling of 231230031120021 in words is "two hundred thirty-one trillion, two hundred thirty billion, thirty-one million, one hundred twenty thousand, twenty-one".