231330013021 has 4 divisors (see below), whose sum is σ = 231556586044. Its totient is φ = 231103440000.

The previous prime is 231330013007. The next prime is 231330013043. The reversal of 231330013021 is 120310033132.

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 169426084996 + 61903928025 = 411614^2 + 248805^2 .

It is a cyclic number.

It is not a de Polignac number, because 231330013021 - 2⁵ = 231330012989 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 231330013021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231330013051) 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, 113284980 + ... + 113287021.

It is an arithmetic number, because the mean of its divisors is an integer number (57889146511).

Almost surely, 2^231330013021 is an apocalyptic number.

It is an amenable number.

231330013021 is a deficient number, since it is larger than the sum of its proper divisors (226573023).

231330013021 is a wasteful number, since it uses less digits than its factorization.

231330013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226573022.

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

Adding to 231330013021 its reverse (120310033132), we get a palindrome (351640046153).

The spelling of 231330013021 in words is "two hundred thirty-one billion, three hundred thirty million, thirteen thousand, twenty-one".