21904730099 has 16 divisors (see below), whose sum is σ = 25087625472. Its totient is φ = 18735301728.

The previous prime is 21904730017. The next prime is 21904730173. The reversal of 21904730099 is 99003740912.

It is a cyclic number.

It is not a de Polignac number, because 21904730099 - 2¹⁶ = 21904664563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21904730009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10514912 + ... + 10516994.

It is an arithmetic number, because the mean of its divisors is an integer number (1567976592).

Almost surely, 2^21904730099 is an apocalyptic number.

21904730099 is a deficient number, since it is larger than the sum of its proper divisors (3182895373).

21904730099 is a wasteful number, since it uses less digits than its factorization.

21904730099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4586.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 21904730099 in words is "twenty-one billion, nine hundred four million, seven hundred thirty thousand, ninety-nine".