21000100099 has 8 divisors (see below), whose sum is σ = 22924665792. Its totient is φ = 19078112040.

The previous prime is 21000100097. The next prime is 21000100111. The reversal of 21000100099 is 99000100012.

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

It is a cyclic number.

It is not a de Polignac number, because 21000100099 - 2¹ = 21000100097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000100097) 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, 627349 + ... + 659974.

It is an arithmetic number, because the mean of its divisors is an integer number (2865583224).

Almost surely, 2^21000100099 is an apocalyptic number.

21000100099 is a deficient number, since it is larger than the sum of its proper divisors (1924565693).

21000100099 is a wasteful number, since it uses less digits than its factorization.

21000100099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288817.

The product of its (nonzero) digits is 162, while the sum is 22.

The spelling of 21000100099 in words is "twenty-one billion, one hundred thousand, ninety-nine".