21200299999 has 4 divisors (see below), whose sum is σ = 21219733080. Its totient is φ = 21180866920.

The previous prime is 21200299969. The next prime is 21200300039. The reversal of 21200299999 is 99999200212.

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 21200299999 - 2³³ = 12610365407 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 (21200299969) 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, 9714904 + ... + 9717085.

It is an arithmetic number, because the mean of its divisors is an integer number (5304933270).

Almost surely, 2^21200299999 is an apocalyptic number.

21200299999 is a deficient number, since it is larger than the sum of its proper divisors (19433081).

21200299999 is a wasteful number, since it uses less digits than its factorization.

21200299999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19433080.

The product of its (nonzero) digits is 472392, while the sum is 52.

The spelling of 21200299999 in words is "twenty-one billion, two hundred million, two hundred ninety-nine thousand, nine hundred ninety-nine".