421536635123 has 16 divisors (see below), whose sum is σ = 437872402176. Its totient is φ = 405500467680.

The previous prime is 421536635089. The next prime is 421536635137. The reversal of 421536635123 is 321536635124.

It is a cyclic number.

It is not a de Polignac number, because 421536635123 - 2⁸ = 421536634867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421536635183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16186853 + ... + 16212873.

It is an arithmetic number, because the mean of its divisors is an integer number (27367025136).

Almost surely, 2^421536635123 is an apocalyptic number.

421536635123 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

421536635123 is a deficient number, since it is larger than the sum of its proper divisors (16335767053).

421536635123 is a wasteful number, since it uses less digits than its factorization.

421536635123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31754.

The product of its digits is 388800, while the sum is 41.

Subtracting from 421536635123 its reverse (321536635124), we obtain a palindrome (99999999999).

The spelling of 421536635123 in words is "four hundred twenty-one billion, five hundred thirty-six million, six hundred thirty-five thousand, one hundred twenty-three".