231231021023 has 16 divisors (see below), whose sum is σ = 238557338880. Its totient is φ = 224047524096.

The previous prime is 231231021017. The next prime is 231231021053. The reversal of 231231021023 is 320120132132.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231231021023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231231020986 and 231231021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231021053) 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, 950198 + ... + 1168476.

It is an arithmetic number, because the mean of its divisors is an integer number (14909833680).

Almost surely, 2^231231021023 is an apocalyptic number.

231231021023 is a deficient number, since it is larger than the sum of its proper divisors (7326317857).

231231021023 is a wasteful number, since it uses less digits than its factorization.

231231021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218606.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 231231021023 its reverse (320120132132), we get a palindrome (551351153155).

The spelling of 231231021023 in words is "two hundred thirty-one billion, two hundred thirty-one million, twenty-one thousand, twenty-three".