123213223202221 has 6 divisors (see below), whose sum is σ = 124715605376270. Its totient is φ = 121728726530328.

The previous prime is 123213223202191. The next prime is 123213223202249. The reversal of 123213223202221 is 122202322312321.

It can be written as a sum of positive squares in only one way, i.e., 70529578479721 + 52683644722500 = 8398189^2 + 7258350^2 .

It is not a de Polignac number, because 123213223202221 - 2⁵ = 123213223202189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123213223202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123213293202221) 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 5 ways as a sum of consecutive naturals, for example, 8942744106 + ... + 8942757883.

Almost surely, 2^{123213223202221} is an apocalyptic number.

It is an amenable number.

123213223202221 is a deficient number, since it is larger than the sum of its proper divisors (1502382174049).

123213223202221 is an frugal number, since it uses more digits than its factorization.

123213223202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17885502155 (or 17885502072 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 123213223202221 its reverse (122202322312321), we get a palindrome (245415545514542).

The spelling of 123213223202221 in words is "one hundred twenty-three trillion, two hundred thirteen billion, two hundred twenty-three million, two hundred two thousand, two hundred twenty-one".