123211131231 has 16 divisors (see below), whose sum is σ = 164708294400. Its totient is φ = 81927498240.

The previous prime is 123211131227. The next prime is 123211131269. The reversal of 123211131231 is 132131112321.

It is not a de Polignac number, because 123211131231 - 2² = 123211131227 is a prime.

It is a super-2 number, since 2×123211131231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123211131198 and 123211131207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123211131731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3975726 + ... + 4006596.

It is an arithmetic number, because the mean of its divisors is an integer number (10294268400).

Almost surely, 2^123211131231 is an apocalyptic number.

123211131231 is a deficient number, since it is larger than the sum of its proper divisors (41497163169).

123211131231 is a wasteful number, since it uses less digits than its factorization.

123211131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34286.

The product of its digits is 216, while the sum is 21.

Adding to 123211131231 its reverse (132131112321), we get a palindrome (255342243552).

The spelling of 123211131231 in words is "one hundred twenty-three billion, two hundred eleven million, one hundred thirty-one thousand, two hundred thirty-one".