21101099999 has 8 divisors (see below), whose sum is σ = 24153765888. Its totient is φ = 18057989880.

The previous prime is 21101099989. The next prime is 21101100061. The reversal of 21101099999 is 99999010112.

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

It is not a de Polignac number, because 21101099999 - 2⁴ = 21101099983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101099939) 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 7 ways as a sum of consecutive naturals, for example, 2384207 + ... + 2393040.

It is an arithmetic number, because the mean of its divisors is an integer number (3019220736).

Almost surely, 2^21101099999 is an apocalyptic number.

21101099999 is a deficient number, since it is larger than the sum of its proper divisors (3052665889).

21101099999 is an equidigital number, since it uses as much as digits as its factorization.

21101099999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777885.

The product of its (nonzero) digits is 118098, while the sum is 50.

The spelling of 21101099999 in words is "twenty-one billion, one hundred one million, ninety-nine thousand, nine hundred ninety-nine".