231330130021 has 4 divisors (see below), whose sum is σ = 231331093344. Its totient is φ = 231329166700.

The previous prime is 231330130007. The next prime is 231330130069. The reversal of 231330130021 is 120031033132.

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, 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 231330130021 - 2⁷ = 231330129893 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 (231330130001) 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, 202086 + ... + 709576.

It is an arithmetic number, because the mean of its divisors is an integer number (57832773336).

Almost surely, 2^231330130021 is an apocalyptic number.

It is an amenable number.

231330130021 is a deficient number, since it is larger than the sum of its proper divisors (963323).

231330130021 is an equidigital number, since it uses as much as digits as its factorization.

231330130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963322.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 231330130021 its reverse (120031033132), we get a palindrome (351361163153).

The spelling of 231330130021 in words is "two hundred thirty-one billion, three hundred thirty million, one hundred thirty thousand, twenty-one".