21546634199 has 4 divisors (see below), whose sum is σ = 21716292864. Its totient is φ = 21376975536.

The previous prime is 21546634147. The next prime is 21546634217. The reversal of 21546634199 is 99143664512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21546634199 - 2⁸ = 21546633943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21546634129) 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, 84829142 + ... + 84829395.

It is an arithmetic number, because the mean of its divisors is an integer number (5429073216).

Almost surely, 2^21546634199 is an apocalyptic number.

21546634199 is a deficient number, since it is larger than the sum of its proper divisors (169658665).

21546634199 is a wasteful number, since it uses less digits than its factorization.

21546634199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169658664.

The product of its digits is 1399680, while the sum is 50.

The spelling of 21546634199 in words is "twenty-one billion, five hundred forty-six million, six hundred thirty-four thousand, one hundred ninety-nine".