231545512222421 has 4 divisors (see below), whose sum is σ = 239014722294144. Its totient is φ = 224076302150700.

The previous prime is 231545512222391. The next prime is 231545512222439. The reversal of 231545512222421 is 124222215545132.

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 231545512222421 - 2³⁴ = 231528332353237 is a prime.

It is a super-2 number, since 2×231545512222421² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231545512222441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3734605035815 + ... + 3734605035876.

It is an arithmetic number, because the mean of its divisors is an integer number (59753680573536).

Almost surely, 2^{231545512222421} is an apocalyptic number.

It is an amenable number.

231545512222421 is a deficient number, since it is larger than the sum of its proper divisors (7469210071723).

231545512222421 is an equidigital number, since it uses as much as digits as its factorization.

231545512222421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7469210071722.

The product of its digits is 384000, while the sum is 41.

Adding to 231545512222421 its reverse (124222215545132), we get a palindrome (355767727767553).

The spelling of 231545512222421 in words is "two hundred thirty-one trillion, five hundred forty-five billion, five hundred twelve million, two hundred twenty-two thousand, four hundred twenty-one".