21100220099 has 8 divisors (see below), whose sum is σ = 24675340800. Its totient is φ = 17665300296.

The previous prime is 21100220069. The next prime is 21100220101. The reversal of 21100220099 is 99002200112.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21100220099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100220069) 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, 35049899 + ... + 35050500.

It is an arithmetic number, because the mean of its divisors is an integer number (3084417600).

Almost surely, 2^21100220099 is an apocalyptic number.

21100220099 is a deficient number, since it is larger than the sum of its proper divisors (3575120701).

21100220099 is an equidigital number, since it uses as much as digits as its factorization.

21100220099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70100449.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 21100220099 in words is "twenty-one billion, one hundred million, two hundred twenty thousand, ninety-nine".