21110101209999 has 24 divisors (see below), whose sum is σ = 32099790110960. Its totient is φ = 13331632033152.

The previous prime is 21110101209991. The next prime is 21110101210001. The reversal of 21110101209999 is 99990210101112.

It is not a de Polignac number, because 21110101209999 - 2³ = 21110101209991 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 (21110101209991) 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, 2770624 + ... + 7063749.

Almost surely, 2^{21110101209999} is an apocalyptic number.

21110101209999 is a deficient number, since it is larger than the sum of its proper divisors (10989688900961).

21110101209999 is a wasteful number, since it uses less digits than its factorization.

21110101209999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9846951 (or 9846948 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 45.

The spelling of 21110101209999 in words is "twenty-one trillion, one hundred ten billion, one hundred one million, two hundred nine thousand, nine hundred ninety-nine".