21204232099 has 2 divisors, whose sum is σ = 21204232100. Its totient is φ = 21204232098.

The previous prime is 21204232043. The next prime is 21204232157. The reversal of 21204232099 is 99023240212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21204232099 - 2¹⁷ = 21204101027 is a prime.

It is not a weakly prime, because it can be changed into another prime (21204332099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10602116049 + 10602116050.

It is an arithmetic number, because the mean of its divisors is an integer number (10602116050).

Almost surely, 2^21204232099 is an apocalyptic number.

21204232099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21204232099 is an equidigital number, since it uses as much as digits as its factorization.

21204232099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 21204232099 in words is "twenty-one billion, two hundred four million, two hundred thirty-two thousand, ninety-nine".