231373021 has 4 divisors (see below), whose sum is σ = 252406944. Its totient is φ = 210339100.

The previous prime is 231373003. The next prime is 231373027. The reversal of 231373021 is 120373132.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 231373021 - 2¹¹ = 231370973 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231372983 and 231373001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231373027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10516945 + ... + 10516966.

It is an arithmetic number, because the mean of its divisors is an integer number (63101736).

Almost surely, 2^231373021 is an apocalyptic number.

It is an amenable number.

231373021 is a deficient number, since it is larger than the sum of its proper divisors (21033923).

231373021 is a wasteful number, since it uses less digits than its factorization.

231373021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21033922.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 231373021 is about 15210.9506934971. The cubic root of 231373021 is about 613.9093375527.

The spelling of 231373021 in words is "two hundred thirty-one million, three hundred seventy-three thousand, twenty-one".