12553144455421 has 8 divisors (see below), whose sum is σ = 12599570995704. Its totient is φ = 12506730351360.

The previous prime is 12553144455329. The next prime is 12553144455463. The reversal of 12553144455421 is 12455444135521.

It can be written as a sum of positive squares in 4 ways, for example, as 136612291321 + 12416532164100 = 369611^2 + 3523710^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12553144455421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12553144455491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1084086 + ... + 5126551.

It is an arithmetic number, because the mean of its divisors is an integer number (1574946374463).

Almost surely, 2^{12553144455421} is an apocalyptic number.

It is an amenable number.

12553144455421 is a deficient number, since it is larger than the sum of its proper divisors (46426540283).

12553144455421 is an equidigital number, since it uses as much as digits as its factorization.

12553144455421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6218111.

The product of its digits is 1920000, while the sum is 46.

The spelling of 12553144455421 in words is "twelve trillion, five hundred fifty-three billion, one hundred forty-four million, four hundred fifty-five thousand, four hundred twenty-one".