123121321231 has 2 divisors, whose sum is σ = 123121321232. Its totient is φ = 123121321230.

The previous prime is 123121321201. The next prime is 123121321259. The reversal of 123121321231 is 132123121321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123121321231 - 2³¹ = 120973837583 is a prime.

It is a super-2 number, since 2×123121321231² (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 (123121321201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560660615 + 61560660616.

It is an arithmetic number, because the mean of its divisors is an integer number (61560660616).

Almost surely, 2^123121321231 is an apocalyptic number.

123121321231 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121321231 is an equidigital number, since it uses as much as digits as its factorization.

123121321231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

Adding to 123121321231 its reverse (132123121321), we get a palindrome (255244442552).

The spelling of 123121321231 in words is "one hundred twenty-three billion, one hundred twenty-one million, three hundred twenty-one thousand, two hundred thirty-one".