21102211999 has 8 divisors (see below), whose sum is σ = 23075280720. Its totient is φ = 19138257600.

The previous prime is 21102211997. The next prime is 21102212051. The reversal of 21102211999 is 99911220112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21102211999 - 2¹ = 21102211997 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 (21102211993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2273734 + ... + 2282995.

It is an arithmetic number, because the mean of its divisors is an integer number (2884410090).

Almost surely, 2^21102211999 is an apocalyptic number.

21102211999 is a deficient number, since it is larger than the sum of its proper divisors (1973068721).

21102211999 is a wasteful number, since it uses less digits than its factorization.

21102211999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4557161.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 21102211999 in words is "twenty-one billion, one hundred two million, two hundred eleven thousand, nine hundred ninety-nine".