20021200211999 has 16 divisors (see below), whose sum is σ = 23687158118400. Its totient is φ = 16559861309280.

The previous prime is 20021200211989. The next prime is 20021200212007. The reversal of 20021200211999 is 99911200212002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20021200211999 - 2³⁶ = 19952480735263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021200211989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132107069 + ... + 132258534.

It is an arithmetic number, because the mean of its divisors is an integer number (1480447382400).

Almost surely, 2^{20021200211999} is an apocalyptic number.

20021200211999 is a deficient number, since it is larger than the sum of its proper divisors (3665957906401).

20021200211999 is a wasteful number, since it uses less digits than its factorization.

20021200211999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264365990.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 20021200211999 in words is "twenty trillion, twenty-one billion, two hundred million, two hundred eleven thousand, nine hundred ninety-nine".