12551314612221 has 48 divisors (see below), whose sum is σ = 22624781961600. Its totient is φ = 6513947458560.

The previous prime is 12551314612219. The next prime is 12551314612223. The reversal of 12551314612221 is 12221641315521.

12551314612221 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 1 + 3 + 14 + 612 + 2 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (12551314612219) and next prime (12551314612223).

It is not a de Polignac number, because 12551314612221 - 2¹ = 12551314612219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12551314612223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7905820 + ... + 9359733.

It is an arithmetic number, because the mean of its divisors is an integer number (471349624200).

Almost surely, 2^{12551314612221} is an apocalyptic number.

12551314612221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12551314612221 is a deficient number, since it is larger than the sum of its proper divisors (10073467349379).

12551314612221 is a wasteful number, since it uses less digits than its factorization.

12551314612221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17266626 (or 17266623 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

Adding to 12551314612221 its reverse (12221641315521), we get a palindrome (24772955927742).

The spelling of 12551314612221 in words is "twelve trillion, five hundred fifty-one billion, three hundred fourteen million, six hundred twelve thousand, two hundred twenty-one".