21202444099 has 4 divisors (see below), whose sum is σ = 21204598464. Its totient is φ = 21200289736.

The previous prime is 21202444061. The next prime is 21202444121. The reversal of 21202444099 is 99044420212.

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 21202444099 - 2³¹ = 19054960451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202444019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062352 + ... + 1082125.

It is an arithmetic number, because the mean of its divisors is an integer number (5301149616).

Almost surely, 2^21202444099 is an apocalyptic number.

21202444099 is a deficient number, since it is larger than the sum of its proper divisors (2154365).

21202444099 is an equidigital number, since it uses as much as digits as its factorization.

21202444099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154364.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 21202444099 in words is "twenty-one billion, two hundred two million, four hundred forty-four thousand, ninety-nine".