21001102110999 has 24 divisors (see below), whose sum is σ = 30342287399424. Its totient is φ = 13997337354000.

The previous prime is 21001102110991. The next prime is 21001102111009. The reversal of 21001102110999 is 99901120110012.

It is not a de Polignac number, because 21001102110999 - 2³ = 21001102110991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001102110991) 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 23 ways as a sum of consecutive naturals, for example, 912643404 + ... + 912666414.

It is an arithmetic number, because the mean of its divisors is an integer number (1264261974976).

Almost surely, 2^{21001102110999} is an apocalyptic number.

21001102110999 is a deficient number, since it is larger than the sum of its proper divisors (9341185288425).

21001102110999 is a wasteful number, since it uses less digits than its factorization.

21001102110999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43219 (or 43216 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 21001102110999 in words is "twenty-one trillion, one billion, one hundred two million, one hundred ten thousand, nine hundred ninety-nine".