21330206699 has 4 divisors (see below), whose sum is σ = 21330568464. Its totient is φ = 21329844936.

The previous prime is 21330206687. The next prime is 21330206713. The reversal of 21330206699 is 99660203312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21330206699 - 2²⁸ = 21061771243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21330206609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69632 + ... + 217965.

It is an arithmetic number, because the mean of its divisors is an integer number (5332642116).

Almost surely, 2^21330206699 is an apocalyptic number.

21330206699 is a deficient number, since it is larger than the sum of its proper divisors (361765).

21330206699 is an equidigital number, since it uses as much as digits as its factorization.

21330206699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361764.

The product of its (nonzero) digits is 104976, while the sum is 41.

The spelling of 21330206699 in words is "twenty-one billion, three hundred thirty million, two hundred six thousand, six hundred ninety-nine".