231232120001321 has 4 divisors (see below), whose sum is σ = 231232554212100. Its totient is φ = 231231685790544.

The previous prime is 231232120001317. The next prime is 231232120001357. The reversal of 231232120001321 is 123100021232132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153765084042025 + 77467035959296 = 12400205^2 + 8801536^2 .

It is a cyclic number.

It is not a de Polignac number, because 231232120001321 - 2² = 231232120001317 is a prime.

It is a super-2 number, since 2×231232120001321² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231232120001221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216305606 + ... + 217371983.

It is an arithmetic number, because the mean of its divisors is an integer number (57808138553025).

Almost surely, 2^{231232120001321} is an apocalyptic number.

It is an amenable number.

231232120001321 is a deficient number, since it is larger than the sum of its proper divisors (434210779).

231232120001321 is an equidigital number, since it uses as much as digits as its factorization.

231232120001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434210778.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 231232120001321 its reverse (123100021232132), we get a palindrome (354332141233453).

The spelling of 231232120001321 in words is "two hundred thirty-one trillion, two hundred thirty-two billion, one hundred twenty million, one thousand, three hundred twenty-one".