12421215554 has 96 divisors (see below), whose sum is σ = 21690789120. Its totient is φ = 5324901120.

The previous prime is 12421215539. The next prime is 12421215607. The reversal of 12421215554 is 45551212421.

It is a super-4 number, since 4×12421215554⁴ (a number of 41 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12421215554.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53309822 + ... + 53310054.

It is an arithmetic number, because the mean of its divisors is an integer number (225945720).

Almost surely, 2^12421215554 is an apocalyptic number.

12421215554 is a deficient number, since it is larger than the sum of its proper divisors (9269573566).

12421215554 is a wasteful number, since it uses less digits than its factorization.

12421215554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 445 counting only the distinct ones).

The product of its digits is 16000, while the sum is 32.

Adding to 12421215554 its reverse (45551212421), we get a palindrome (57972427975).

The spelling of 12421215554 in words is "twelve billion, four hundred twenty-one million, two hundred fifteen thousand, five hundred fifty-four".