20444004220621 has 2 divisors, whose sum is σ = 20444004220622. Its totient is φ = 20444004220620.

The previous prime is 20444004220391. The next prime is 20444004220637. The reversal of 20444004220621 is 12602240044402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16740454080100 + 3703550140521 = 4091510^2 + 1924461^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444004220621 - 2²¹ = 20444002123469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20444004220021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222002110310 + 10222002110311.

It is an arithmetic number, because the mean of its divisors is an integer number (10222002110311).

Almost surely, 2^{20444004220621} is an apocalyptic number.

It is an amenable number.

20444004220621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444004220621 is an equidigital number, since it uses as much as digits as its factorization.

20444004220621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 31.

The spelling of 20444004220621 in words is "twenty trillion, four hundred forty-four billion, four million, two hundred twenty thousand, six hundred twenty-one".