123542421055 has 4 divisors (see below), whose sum is σ = 148250905272. Its totient is φ = 98833936840.

The previous prime is 123542421031. The next prime is 123542421143. The reversal of 123542421055 is 550124245321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123542421055 - 2²⁷ = 123408203327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123542421055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12354242101 + ... + 12354242110.

It is an arithmetic number, because the mean of its divisors is an integer number (37062726318).

Almost surely, 2^123542421055 is an apocalyptic number.

123542421055 is a deficient number, since it is larger than the sum of its proper divisors (24708484217).

123542421055 is an equidigital number, since it uses as much as digits as its factorization.

123542421055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24708484216.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 123542421055 its reverse (550124245321), we get a palindrome (673666666376).

The spelling of 123542421055 in words is "one hundred twenty-three billion, five hundred forty-two million, four hundred twenty-one thousand, fifty-five".