12420420224 has 32 divisors (see below), whose sum is σ = 24751845300. Its totient is φ = 6208192512.

The previous prime is 12420420191. The next prime is 12420420281. The reversal of 12420420224 is 42202402421.

It can be written as a sum of positive squares in 2 ways, for example, as 9107266624 + 3313153600 = 95432^2 + 57560^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 12420420224.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428462 + ... + 456530.

Almost surely, 2^12420420224 is an apocalyptic number.

It is an amenable number.

12420420224 is a deficient number, since it is larger than the sum of its proper divisors (12331425076).

12420420224 is an equidigital number, since it uses as much as digits as its factorization.

12420420224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31540 (or 31528 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 12420420224 its reverse (42202402421), we get a palindrome (54622822645).

The spelling of 12420420224 in words is "twelve billion, four hundred twenty million, four hundred twenty thousand, two hundred twenty-four".