21010100099 has 16 divisors (see below), whose sum is σ = 22348021824. Its totient is φ = 19707916800.

The previous prime is 21010100087. The next prime is 21010100101. The reversal of 21010100099 is 99000101012.

It is a cyclic number.

It is not a de Polignac number, because 21010100099 - 2⁸ = 21010099843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010100039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4728719 + ... + 4733159.

It is an arithmetic number, because the mean of its divisors is an integer number (1396751364).

Almost surely, 2^21010100099 is an apocalyptic number.

21010100099 is a deficient number, since it is larger than the sum of its proper divisors (1337921725).

21010100099 is a wasteful number, since it uses less digits than its factorization.

21010100099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8398.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 21010100099 in words is "twenty-one billion, ten million, one hundred thousand, ninety-nine".