21899709199 has 2 divisors, whose sum is σ = 21899709200. Its totient is φ = 21899709198.

The previous prime is 21899709197. The next prime is 21899709203. The reversal of 21899709199 is 99190799812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21899709199 - 2¹ = 21899709197 is a prime.

Together with 21899709197, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21899709199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21899709193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10949854599 + 10949854600.

It is an arithmetic number, because the mean of its divisors is an integer number (10949854600).

Almost surely, 2^21899709199 is an apocalyptic number.

21899709199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21899709199 is an equidigital number, since it uses as much as digits as its factorization.

21899709199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6613488, while the sum is 64.

The spelling of 21899709199 in words is "twenty-one billion, eight hundred ninety-nine million, seven hundred nine thousand, one hundred ninety-nine".