21220220199599 has 2 divisors, whose sum is σ = 21220220199600. Its totient is φ = 21220220199598.

The previous prime is 21220220199583. The next prime is 21220220199617. The reversal of 21220220199599 is 99599102202212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220220199599 - 2⁴ = 21220220199583 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220220199599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220220199539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610110099799 + 10610110099800.

It is an arithmetic number, because the mean of its divisors is an integer number (10610110099800).

Almost surely, 2^{21220220199599} is an apocalyptic number.

21220220199599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220220199599 is an equidigital number, since it uses as much as digits as its factorization.

21220220199599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The spelling of 21220220199599 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty million, one hundred ninety-nine thousand, five hundred ninety-nine".