21384323604199 has 2 divisors, whose sum is σ = 21384323604200. Its totient is φ = 21384323604198.

The previous prime is 21384323604173. The next prime is 21384323604233. The reversal of 21384323604199 is 99140632348312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21384323604199 - 2²¹ = 21384321507047 is a prime.

It is a super-2 number, since 2×21384323604199² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21384323604299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10692161802099 + 10692161802100.

It is an arithmetic number, because the mean of its divisors is an integer number (10692161802100).

Almost surely, 2^{21384323604199} is an apocalyptic number.

21384323604199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21384323604199 is an equidigital number, since it uses as much as digits as its factorization.

21384323604199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 55.

The spelling of 21384323604199 in words is "twenty-one trillion, three hundred eighty-four billion, three hundred twenty-three million, six hundred four thousand, one hundred ninety-nine".