12405450421 has 64 divisors (see below), whose sum is σ = 16003266048. Its totient is φ = 9357078528.

The previous prime is 12405450413. The next prime is 12405450427.

12405450421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12405450421 - 2³ = 12405450413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12405450421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12405450427) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39133755 + ... + 39134071.

It is an arithmetic number, because the mean of its divisors is an integer number (250051032).

Almost surely, 2^12405450421 is an apocalyptic number.

It is an amenable number.

12405450421 is a deficient number, since it is larger than the sum of its proper divisors (3597815627).

12405450421 is a wasteful number, since it uses less digits than its factorization.

12405450421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590.

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 12405450421 in words is "twelve billion, four hundred five million, four hundred fifty thousand, four hundred twenty-one".