123543555342121 has 4 divisors (see below), whose sum is σ = 125032031912592. Its totient is φ = 122055078771652.

The previous prime is 123543555342079. The next prime is 123543555342209. The reversal of 123543555342121 is 121243555345321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123543555342121 - 2¹⁷ = 123543555211049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123543555348121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744238285111 + ... + 744238285276.

It is an arithmetic number, because the mean of its divisors is an integer number (31258007978148).

Almost surely, 2^{123543555342121} is an apocalyptic number.

It is an amenable number.

123543555342121 is a deficient number, since it is larger than the sum of its proper divisors (1488476570471).

123543555342121 is an equidigital number, since it uses as much as digits as its factorization.

123543555342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488476570470.

The product of its digits is 2160000, while the sum is 46.

The spelling of 123543555342121 in words is "one hundred twenty-three trillion, five hundred forty-three billion, five hundred fifty-five million, three hundred forty-two thousand, one hundred twenty-one".