21002000099 has 2 divisors, whose sum is σ = 21002000100. Its totient is φ = 21002000098.

The previous prime is 21002000083. The next prime is 21002000147. The reversal of 21002000099 is 99000020012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002000099 - 2⁴ = 21002000083 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002000009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501000049 + 10501000050.

It is an arithmetic number, because the mean of its divisors is an integer number (10501000050).

Almost surely, 2^21002000099 is an apocalyptic number.

21002000099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002000099 is an equidigital number, since it uses as much as digits as its factorization.

21002000099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21002000099 in words is "twenty-one billion, two million, ninety-nine", and thus it is an aban number and an uban number.