231512220401 has 32 divisors (see below), whose sum is σ = 293614156800. Its totient is φ = 177291161280.

The previous prime is 231512220397. The next prime is 231512220403. The reversal of 231512220401 is 104022215132.

It is a cyclic number.

It is not a de Polignac number, because 231512220401 - 2² = 231512220397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231512220403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27494570 + ... + 27502988.

It is an arithmetic number, because the mean of its divisors is an integer number (9175442400).

Almost surely, 2^231512220401 is an apocalyptic number.

It is an amenable number.

231512220401 is a deficient number, since it is larger than the sum of its proper divisors (62101936399).

231512220401 is a wasteful number, since it uses less digits than its factorization.

231512220401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14549.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 231512220401 its reverse (104022215132), we get a palindrome (335534435533).

The spelling of 231512220401 in words is "two hundred thirty-one billion, five hundred twelve million, two hundred twenty thousand, four hundred one".