21306499799 has 8 divisors (see below), whose sum is σ = 22947440880. Its totient is φ = 19665841536.

The previous prime is 21306499793. The next prime is 21306499817. The reversal of 21306499799 is 99799460312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21306499799 - 2²⁸ = 21038064343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21306499793) 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 7 ways as a sum of consecutive naturals, for example, 101279 + ... + 229935.

It is an arithmetic number, because the mean of its divisors is an integer number (2868430110).

Almost surely, 2^21306499799 is an apocalyptic number.

21306499799 is a deficient number, since it is larger than the sum of its proper divisors (1640941081).

21306499799 is a wasteful number, since it uses less digits than its factorization.

21306499799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141409.

The product of its (nonzero) digits is 6613488, while the sum is 59.

The spelling of 21306499799 in words is "twenty-one billion, three hundred six million, four hundred ninety-nine thousand, seven hundred ninety-nine".