231320123223021 has 64 divisors (see below), whose sum is σ = 392565899174400. Its totient is φ = 131875181568000.

The previous prime is 231320123223019. The next prime is 231320123223037. The reversal of 231320123223021 is 120322321023132.

231320123223021 is a `hidden beast` number, since 2 + 3 + 1 + 3 + 20 + 12 + 322 + 302 + 1 = 666.

It is not a de Polignac number, because 231320123223021 - 2¹ = 231320123223019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231320123323021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156881035 + ... + 158348663.

It is an arithmetic number, because the mean of its divisors is an integer number (6133842174600).

Almost surely, 2^{231320123223021} is an apocalyptic number.

231320123223021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231320123223021 is a deficient number, since it is larger than the sum of its proper divisors (161245775951379).

231320123223021 is a wasteful number, since it uses less digits than its factorization.

231320123223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469587 (or 1469581 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 231320123223021 its reverse (120322321023132), we get a palindrome (351642444246153).

The spelling of 231320123223021 in words is "two hundred thirty-one trillion, three hundred twenty billion, one hundred twenty-three million, two hundred twenty-three thousand, twenty-one".