21001101100209 has 24 divisors (see below), whose sum is σ = 32826197756352. Its totient is φ = 13392006495120.

The previous prime is 21001101100183. The next prime is 21001101100247. The reversal of 21001101100209 is 90200110110012.

It is a happy number.

It is not a de Polignac number, because 21001101100209 - 2²⁸ = 21000832664753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001101100191 and 21001101100200.

It is not an unprimeable number, because it can be changed into a prime (21001101100289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1878783202 + ... + 1878794379.

It is an arithmetic number, because the mean of its divisors is an integer number (1367758239848).

Almost surely, 2^{21001101100209} is an apocalyptic number.

It is an amenable number.

21001101100209 is a deficient number, since it is larger than the sum of its proper divisors (11825096656143).

21001101100209 is an equidigital number, since it uses as much as digits as its factorization.

21001101100209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757577619 (or 3757577607 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 21001101100209 in words is "twenty-one trillion, one billion, one hundred one million, one hundred thousand, two hundred nine".