231321011021 has 16 divisors (see below), whose sum is σ = 234863193600. Its totient is φ = 227812975488.

The previous prime is 231321011011. The next prime is 231321011101. The reversal of 231321011021 is 120110123132.

It is a cyclic number.

It is not a de Polignac number, because 231321011021 - 2¹⁴ = 231320994637 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 (231321011011) 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, 8794736 + ... + 8820998.

It is an arithmetic number, because the mean of its divisors is an integer number (14678949600).

Almost surely, 2^231321011021 is an apocalyptic number.

It is an amenable number.

231321011021 is a deficient number, since it is larger than the sum of its proper divisors (3542182579).

231321011021 is a wasteful number, since it uses less digits than its factorization.

231321011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26908.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 231321011021 its reverse (120110123132), we get a palindrome (351431134153).

The spelling of 231321011021 in words is "two hundred thirty-one billion, three hundred twenty-one million, eleven thousand, twenty-one".