12642550400621 has 2 divisors, whose sum is σ = 12642550400622. Its totient is φ = 12642550400620.

The previous prime is 12642550400617. The next prime is 12642550400657. The reversal of 12642550400621 is 12600405524621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7612555555396 + 5029994845225 = 2759086^2 + 2242765^2 .

It is a cyclic number.

It is not a de Polignac number, because 12642550400621 - 2² = 12642550400617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12642550400681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321275200310 + 6321275200311.

It is an arithmetic number, because the mean of its divisors is an integer number (6321275200311).

Almost surely, 2^{12642550400621} is an apocalyptic number.

It is an amenable number.

12642550400621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642550400621 is an equidigital number, since it uses as much as digits as its factorization.

12642550400621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 12642550400621 in words is "twelve trillion, six hundred forty-two billion, five hundred fifty million, four hundred thousand, six hundred twenty-one".