123421355231 has 2 divisors, whose sum is σ = 123421355232. Its totient is φ = 123421355230.

The previous prime is 123421355221. The next prime is 123421355251. The reversal of 123421355231 is 132553124321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123421355231 - 2¹⁴ = 123421338847 is a prime.

It is a super-2 number, since 2×123421355231² (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 (123421355201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61710677615 + 61710677616.

It is an arithmetic number, because the mean of its divisors is an integer number (61710677616).

Almost surely, 2^123421355231 is an apocalyptic number.

123421355231 is a deficient number, since it is larger than the sum of its proper divisors (1).

123421355231 is an equidigital number, since it uses as much as digits as its factorization.

123421355231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

Adding to 123421355231 its reverse (132553124321), we get a palindrome (255974479552).

The spelling of 123421355231 in words is "one hundred twenty-three billion, four hundred twenty-one million, three hundred fifty-five thousand, two hundred thirty-one".