21194599099 has 8 divisors (see below), whose sum is σ = 21654255168. Its totient is φ = 20735305920.

The previous prime is 21194599051. The next prime is 21194599103. The reversal of 21194599099 is 99099549112.

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 21194599099 - 2⁹ = 21194598587 is a prime.

It is a super-2 number, since 2×21194599099² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21194599799) 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, 29049 + ... + 207925.

It is an arithmetic number, because the mean of its divisors is an integer number (2706781896).

Almost surely, 2^21194599099 is an apocalyptic number.

21194599099 is a deficient number, since it is larger than the sum of its proper divisors (459656069).

21194599099 is a wasteful number, since it uses less digits than its factorization.

21194599099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181445.

The product of its (nonzero) digits is 2361960, while the sum is 58.

The spelling of 21194599099 in words is "twenty-one billion, one hundred ninety-four million, five hundred ninety-nine thousand, ninety-nine".