123354235452421 has 2 divisors, whose sum is σ = 123354235452422. Its totient is φ = 123354235452420.

The previous prime is 123354235452341. The next prime is 123354235452449. The reversal of 123354235452421 is 124254532453321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104836834308196 + 18517401144225 = 10238986^2 + 4303185^2 .

It is a cyclic number.

It is not a de Polignac number, because 123354235452421 - 2⁷ = 123354235452293 is a prime.

It is a super-2 number, since 2×123354235452421² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123354235452491) 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, 61677117726210 + 61677117726211.

It is an arithmetic number, because the mean of its divisors is an integer number (61677117726211).

Almost surely, 2^{123354235452421} is an apocalyptic number.

It is an amenable number.

123354235452421 is a deficient number, since it is larger than the sum of its proper divisors (1).

123354235452421 is an equidigital number, since it uses as much as digits as its factorization.

123354235452421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456000, while the sum is 46.

The spelling of 123354235452421 in words is "one hundred twenty-three trillion, three hundred fifty-four billion, two hundred thirty-five million, four hundred fifty-two thousand, four hundred twenty-one".