123031140553421 has 2 divisors, whose sum is σ = 123031140553422. Its totient is φ = 123031140553420.

The previous prime is 123031140553397. The next prime is 123031140553511. The reversal of 123031140553421 is 124355041130321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87865220586025 + 35165919967396 = 9373645^2 + 5930086^2 .

It is a cyclic number.

It is not a de Polignac number, because 123031140553421 - 2¹⁴ = 123031140537037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123031140556421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61515570276710 + 61515570276711.

It is an arithmetic number, because the mean of its divisors is an integer number (61515570276711).

Almost surely, 2^{123031140553421} is an apocalyptic number.

It is an amenable number.

123031140553421 is a deficient number, since it is larger than the sum of its proper divisors (1).

123031140553421 is an equidigital number, since it uses as much as digits as its factorization.

123031140553421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 123031140553421 its reverse (124355041130321), we get a palindrome (247386181683742).

The spelling of 123031140553421 in words is "one hundred twenty-three trillion, thirty-one billion, one hundred forty million, five hundred fifty-three thousand, four hundred twenty-one".