123011220231 has 12 divisors (see below), whose sum is σ = 187034604120. Its totient is φ = 77691296880.

The previous prime is 123011220223. The next prime is 123011220251. The reversal of 123011220231 is 132022110321.

123011220231 is a `hidden beast` number, since 12 + 301 + 122 + 0 + 231 = 666.

It is not a de Polignac number, because 123011220231 - 2³ = 123011220223 is a prime.

It is a super-2 number, since 2×123011220231² (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 (123011220251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359681760 + ... + 359682101.

It is an arithmetic number, because the mean of its divisors is an integer number (15586217010).

Almost surely, 2^123011220231 is an apocalyptic number.

123011220231 is a deficient number, since it is larger than the sum of its proper divisors (64023383889).

123011220231 is a wasteful number, since it uses less digits than its factorization.

123011220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719363886 (or 719363883 counting only the distinct ones).

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

Adding to 123011220231 its reverse (132022110321), we get a palindrome (255033330552).

The spelling of 123011220231 in words is "one hundred twenty-three billion, eleven million, two hundred twenty thousand, two hundred thirty-one".