21000021110999 has 16 divisors (see below), whose sum is σ = 24428495855616. Its totient is φ = 17681470884000.

The previous prime is 21000021110953. The next prime is 21000021111001. The reversal of 21000021110999 is 99901112000012.

It is not a de Polignac number, because 21000021110999 - 2⁸ = 21000021110743 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 (21000021112999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116851157 + ... + 117030734.

It is an arithmetic number, because the mean of its divisors is an integer number (1526780990976).

Almost surely, 2^{21000021110999} is an apocalyptic number.

21000021110999 is a deficient number, since it is larger than the sum of its proper divisors (3428474744617).

21000021110999 is a wasteful number, since it uses less digits than its factorization.

21000021110999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233882126.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 21000021110999 in words is "twenty-one trillion, twenty-one million, one hundred ten thousand, nine hundred ninety-nine".