213023231013121 has 4 divisors (see below), whose sum is σ = 213025766574852. Its totient is φ = 213020695451392.

The previous prime is 213023231013017. The next prime is 213023231013139. The reversal of 213023231013121 is 121310132320312.

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 17199591323121 + 195823639690000 = 4147239^2 + 13993700^2 .

It is a cyclic number.

It is not a de Polignac number, because 213023231013121 - 2¹⁵ = 213023230980353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213023231013161) 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, 1267654840 + ... + 1267822873.

It is an arithmetic number, because the mean of its divisors is an integer number (53256441643713).

Almost surely, 2^{213023231013121} is an apocalyptic number.

It is an amenable number.

213023231013121 is a deficient number, since it is larger than the sum of its proper divisors (2535561731).

213023231013121 is an equidigital number, since it uses as much as digits as its factorization.

213023231013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535561730.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 213023231013121 its reverse (121310132320312), we get a palindrome (334333363333433).

The spelling of 213023231013121 in words is "two hundred thirteen trillion, twenty-three billion, two hundred thirty-one million, thirteen thousand, one hundred twenty-one".