21110200999 has 4 divisors (see below), whose sum is σ = 21114450936. Its totient is φ = 21105951064.

The previous prime is 21110200967. The next prime is 21110201017. The reversal of 21110200999 is 99900201112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21110200999 - 2⁵ = 21110200967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110200919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2117509 + ... + 2127454.

It is an arithmetic number, because the mean of its divisors is an integer number (5278612734).

Almost surely, 2^21110200999 is an apocalyptic number.

21110200999 is a deficient number, since it is larger than the sum of its proper divisors (4249937).

21110200999 is an equidigital number, since it uses as much as digits as its factorization.

21110200999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249936.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 21110200999 in words is "twenty-one billion, one hundred ten million, two hundred thousand, nine hundred ninety-nine".