21624112099 has 4 divisors (see below), whose sum is σ = 21624419520. Its totient is φ = 21623804680.

The previous prime is 21624112063. The next prime is 21624112109. The reversal of 21624112099 is 99021142612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21624112099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21624110099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9729 + ... + 208189.

It is an arithmetic number, because the mean of its divisors is an integer number (5406104880).

Almost surely, 2^21624112099 is an apocalyptic number.

21624112099 is a deficient number, since it is larger than the sum of its proper divisors (307421).

21624112099 is a wasteful number, since it uses less digits than its factorization.

21624112099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307420.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 21624112099 in words is "twenty-one billion, six hundred twenty-four million, one hundred twelve thousand, ninety-nine".