12554109721 has 2 divisors, whose sum is σ = 12554109722. Its totient is φ = 12554109720.

The previous prime is 12554109661. The next prime is 12554109751. The reversal of 12554109721 is 12790145521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8660349721 + 3893760000 = 93061^2 + 62400^2 .

It is a cyclic number.

It is not a de Polignac number, because 12554109721 - 2²³ = 12545721113 is a prime.

It is not a weakly prime, because it can be changed into another prime (12554109751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277054860 + 6277054861.

It is an arithmetic number, because the mean of its divisors is an integer number (6277054861).

Almost surely, 2^12554109721 is an apocalyptic number.

It is an amenable number.

12554109721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12554109721 is an equidigital number, since it uses as much as digits as its factorization.

12554109721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 12554109721 in words is "twelve billion, five hundred fifty-four million, one hundred nine thousand, seven hundred twenty-one".