21004202999 has 4 divisors (see below), whose sum is σ = 22619910936. Its totient is φ = 19388495064.

The previous prime is 21004202993. The next prime is 21004203029. The reversal of 21004202999 is 99920240012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004202999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004202993) 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 3 ways as a sum of consecutive naturals, for example, 807853949 + ... + 807853974.

It is an arithmetic number, because the mean of its divisors is an integer number (5654977734).

Almost surely, 2^21004202999 is an apocalyptic number.

21004202999 is a deficient number, since it is larger than the sum of its proper divisors (1615707937).

21004202999 is a wasteful number, since it uses less digits than its factorization.

21004202999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615707936.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 21004202999 in words is "twenty-one billion, four million, two hundred two thousand, nine hundred ninety-nine".