123321203230021 has 4 divisors (see below), whose sum is σ = 123321430858444. Its totient is φ = 123320975601600.

The previous prime is 123321203229989. The next prime is 123321203230039. The reversal of 123321203230021 is 120032302123321.

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 48669961620996 + 74651241609025 = 6976386^2 + 8640095^2 .

It is a cyclic number.

It is not a de Polignac number, because 123321203230021 - 2⁵ = 123321203229989 is a prime.

It is a super-2 number, since 2×123321203230021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123321203230051) 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, 112999620 + ... + 114085741.

It is an arithmetic number, because the mean of its divisors is an integer number (30830357714611).

Almost surely, 2^{123321203230021} is an apocalyptic number.

It is an amenable number.

123321203230021 is a deficient number, since it is larger than the sum of its proper divisors (227628423).

123321203230021 is an equidigital number, since it uses as much as digits as its factorization.

123321203230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227628422.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 123321203230021 its reverse (120032302123321), we get a palindrome (243353505353342).

The spelling of 123321203230021 in words is "one hundred twenty-three trillion, three hundred twenty-one billion, two hundred three million, two hundred thirty thousand, twenty-one".