231353021 has 4 divisors (see below), whose sum is σ = 241411872. Its totient is φ = 221294172.

The previous prime is 231353009. The next prime is 231353069. The reversal of 231353021 is 120353132.

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 231353021 - 2²² = 227158717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231352984 and 231353002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231353071) 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, 5029391 + ... + 5029436.

It is an arithmetic number, because the mean of its divisors is an integer number (60352968).

Almost surely, 2^231353021 is an apocalyptic number.

It is an amenable number.

231353021 is a deficient number, since it is larger than the sum of its proper divisors (10058851).

231353021 is a wasteful number, since it uses less digits than its factorization.

231353021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10058850.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 231353021 is about 15210.2932581854. The cubic root of 231353021 is about 613.8916481660.

The spelling of 231353021 in words is "two hundred thirty-one million, three hundred fifty-three thousand, twenty-one".