123011321231 has 2 divisors, whose sum is σ = 123011321232. Its totient is φ = 123011321230.

The previous prime is 123011321183. The next prime is 123011321249. The reversal of 123011321231 is 132123110321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123011321231 - 2¹⁰ = 123011320207 is a prime.

It is a super-2 number, since 2×123011321231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123011321261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61505660615 + 61505660616.

It is an arithmetic number, because the mean of its divisors is an integer number (61505660616).

Almost surely, 2^123011321231 is an apocalyptic number.

123011321231 is a deficient number, since it is larger than the sum of its proper divisors (1).

123011321231 is an equidigital number, since it uses as much as digits as its factorization.

123011321231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 123011321231 its reverse (132123110321), we get a palindrome (255134431552).

The spelling of 123011321231 in words is "one hundred twenty-three billion, eleven million, three hundred twenty-one thousand, two hundred thirty-one".