231360021 has 24 divisors (see below), whose sum is σ = 357116760. Its totient is φ = 143824896.

The previous prime is 231359971. The next prime is 231360029. The reversal of 231360021 is 120063132.

It can be written as a sum of positive squares in 4 ways, for example, as 78960996 + 152399025 = 8886^2 + 12345^2 .

It is not a de Polignac number, because 231360021 - 2¹⁰ = 231358997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231359976 and 231360003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231360029) 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 23 ways as a sum of consecutive naturals, for example, 9741 + ... + 23613.

It is an arithmetic number, because the mean of its divisors is an integer number (14879865).

Almost surely, 2^231360021 is an apocalyptic number.

It is an amenable number.

231360021 is a deficient number, since it is larger than the sum of its proper divisors (125756739).

231360021 is a wasteful number, since it uses less digits than its factorization.

231360021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14005 (or 14002 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 231360021 is about 15210.5233637768. The cubic root of 231360021 is about 613.8978395673.

The spelling of 231360021 in words is "two hundred thirty-one million, three hundred sixty thousand, twenty-one".