231021123 has 4 divisors (see below), whose sum is σ = 308028168. Its totient is φ = 154014080.

The previous prime is 231021113. The next prime is 231021137. The reversal of 231021123 is 321120132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231021123 - 2¹⁰ = 231020099 is a prime.

It is a super-2 number, since 2×231021123² = 106741518544362258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38503518 + ... + 38503523.

It is an arithmetic number, because the mean of its divisors is an integer number (77007042).

Almost surely, 2^231021123 is an apocalyptic number.

231021123 is a deficient number, since it is larger than the sum of its proper divisors (77007045).

231021123 is an equidigital number, since it uses as much as digits as its factorization.

231021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77007044.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 231021123 is about 15199.3790333684. The cubic root of 231021123 is about 613.5979456103.

Adding to 231021123 its reverse (321120132), we get a palindrome (552141255).

Subtracting 231021123 from its reverse (321120132), we obtain a palindrome (90099009).

The spelling of 231021123 in words is "two hundred thirty-one million, twenty-one thousand, one hundred twenty-three".