12551400221 has 16 divisors (see below), whose sum is σ = 13008476160. Its totient is φ = 12100777920.

The previous prime is 12551400217. The next prime is 12551400283. The reversal of 12551400221 is 12200415521.

It is a cyclic number.

It is not a de Polignac number, because 12551400221 - 2² = 12551400217 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 (12551400821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6065375 + ... + 6067443.

It is an arithmetic number, because the mean of its divisors is an integer number (813029760).

Almost surely, 2^12551400221 is an apocalyptic number.

It is an amenable number.

12551400221 is a deficient number, since it is larger than the sum of its proper divisors (457075939).

12551400221 is a wasteful number, since it uses less digits than its factorization.

12551400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 12551400221 its reverse (12200415521), we get a palindrome (24751815742).

The spelling of 12551400221 in words is "twelve billion, five hundred fifty-one million, four hundred thousand, two hundred twenty-one".