13644222244621 has 2 divisors, whose sum is σ = 13644222244622. Its totient is φ = 13644222244620.

The previous prime is 13644222244607. The next prime is 13644222244637. The reversal of 13644222244621 is 12644222244631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11274746968521 + 2369475276100 = 3357789^2 + 1539310^2 .

It is a cyclic number.

It is not a de Polignac number, because 13644222244621 - 2¹⁵ = 13644222211853 is a prime.

It is a super-2 number, since 2×13644222244621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13644222248621) 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 as a sum of consecutive naturals, namely, 6822111122310 + 6822111122311.

It is an arithmetic number, because the mean of its divisors is an integer number (6822111122311).

Almost surely, 2^{13644222244621} is an apocalyptic number.

It is an amenable number.

13644222244621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644222244621 is an equidigital number, since it uses as much as digits as its factorization.

13644222244621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 43.

The spelling of 13644222244621 in words is "thirteen trillion, six hundred forty-four billion, two hundred twenty-two million, two hundred forty-four thousand, six hundred twenty-one".