123211321221231 has 8 divisors (see below), whose sum is σ = 182535290698160. Its totient is φ = 82140880814136.

The previous prime is 123211321221221. The next prime is 123211321221259. The reversal of 123211321221231 is 132122123112321.

123211321221231 is a `hidden beast` number, since 1 + 2 + 3 + 211 + 3 + 212 + 2 + 1 + 231 = 666.

It is not a de Polignac number, because 123211321221231 - 2¹³ = 123211321213039 is a prime.

It is a super-2 number, since 2×123211321221231² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4563382267453 = 123211321221231 / (1 + 2 + 3 + 2 + 1 + 1 + 3 + 2 + 1 + 2 + 2 + 1 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123211321221195 and 123211321221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123211321221221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2281691133700 + ... + 2281691133753.

It is an arithmetic number, because the mean of its divisors is an integer number (22816911337270).

Almost surely, 2^{123211321221231} is an apocalyptic number.

123211321221231 is a deficient number, since it is larger than the sum of its proper divisors (59323969476929).

123211321221231 is an equidigital number, since it uses as much as digits as its factorization.

123211321221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563382267462 (or 4563382267456 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

Adding to 123211321221231 its reverse (132122123112321), we get a palindrome (255333444333552).

The spelling of 123211321221231 in words is "one hundred twenty-three trillion, two hundred eleven billion, three hundred twenty-one million, two hundred twenty-one thousand, two hundred thirty-one".