421550505055123 has 12 divisors (see below), whose sum is σ = 431583904820640. Its totient is φ = 411745181507856.

The previous prime is 421550505055111. The next prime is 421550505055193. The reversal of 421550505055123 is 321550505055124.

It is not a de Polignac number, because 421550505055123 - 2²¹ = 421550502957971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

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 421550505055123.

It is not an unprimeable number, because it can be changed into a prime (421550505055103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 630050758 + ... + 630719476.

It is an arithmetic number, because the mean of its divisors is an integer number (35965325401720).

Almost surely, 2^{421550505055123} is an apocalyptic number.

421550505055123 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

421550505055123 is a deficient number, since it is larger than the sum of its proper divisors (10033399765517).

421550505055123 is an equidigital number, since it uses as much as digits as its factorization.

421550505055123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009738 (or 1009695 counting only the distinct ones).

The product of its (nonzero) digits is 750000, while the sum is 43.

Subtracting from 421550505055123 its reverse (321550505055124), we obtain a palindrome (99999999999999).

The spelling of 421550505055123 in words is "four hundred twenty-one trillion, five hundred fifty billion, five hundred five million, fifty-five thousand, one hundred twenty-three".