20021020021999 has 2 divisors, whose sum is σ = 20021020022000. Its totient is φ = 20021020021998.

The previous prime is 20021020021987. The next prime is 20021020022021. The reversal of 20021020021999 is 99912002012002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021020021999 - 2²⁵ = 20020986467567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021020021099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510010999 + 10010510011000.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510011000).

Almost surely, 2^{20021020021999} is an apocalyptic number.

20021020021999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021020021999 is an equidigital number, since it uses as much as digits as its factorization.

20021020021999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The spelling of 20021020021999 in words is "twenty trillion, twenty-one billion, twenty million, twenty-one thousand, nine hundred ninety-nine".