231441021 has 24 divisors (see below), whose sum is σ = 382761600. Its totient is φ = 132009696.

The previous prime is 231441017. The next prime is 231441037. The reversal of 231441021 is 120144132.

231441021 is a `hidden beast` number, since 231 + 4 + 410 + 21 = 666.

It is not a de Polignac number, because 231441021 - 2² = 231441017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231440985 and 231441003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231441061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34671 + ... + 40803.

It is an arithmetic number, because the mean of its divisors is an integer number (15948400).

Almost surely, 2^231441021 is an apocalyptic number.

231441021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231441021 is a deficient number, since it is larger than the sum of its proper divisors (151320579).

231441021 is a wasteful number, since it uses less digits than its factorization.

231441021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6745 (or 6742 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 231441021 is about 15213.1857610430. The cubic root of 231441021 is about 613.9694738437.

Adding to 231441021 its reverse (120144132), we get a palindrome (351585153).

The spelling of 231441021 in words is "two hundred thirty-one million, four hundred forty-one thousand, twenty-one".