123200121231 has 20 divisors (see below), whose sum is σ = 200770569384. Its totient is φ = 74666739600.

The previous prime is 123200121227. The next prime is 123200121241. The reversal of 123200121231 is 132121002321.

It is not a de Polignac number, because 123200121231 - 2² = 123200121227 is a prime.

It is a super-2 number, since 2×123200121231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123200121241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 69134980 + ... + 69136761.

Almost surely, 2^123200121231 is an apocalyptic number.

123200121231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123200121231 is a deficient number, since it is larger than the sum of its proper divisors (77570448153).

123200121231 is a wasteful number, since it uses less digits than its factorization.

123200121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138271764 (or 138271755 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 123200121231 its reverse (132121002321), we get a palindrome (255321123552).

The spelling of 123200121231 in words is "one hundred twenty-three billion, two hundred million, one hundred twenty-one thousand, two hundred thirty-one".