21200111021999 has 32 divisors (see below), whose sum is σ = 26284285655040. Its totient is φ = 16650400580352.

The previous prime is 21200111021983. The next prime is 21200111022011. The reversal of 21200111021999 is 99912011100212.

It is not a de Polignac number, because 21200111021999 - 2⁴ = 21200111021983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200111021399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 339806762 + ... + 339869144.

It is an arithmetic number, because the mean of its divisors is an integer number (821383926720).

Almost surely, 2^{21200111021999} is an apocalyptic number.

21200111021999 is a deficient number, since it is larger than the sum of its proper divisors (5084174633041).

21200111021999 is a wasteful number, since it uses less digits than its factorization.

21200111021999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89799.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 21200111021999 in words is "twenty-one trillion, two hundred billion, one hundred eleven million, twenty-one thousand, nine hundred ninety-nine".