21802855199 has 2 divisors, whose sum is σ = 21802855200. Its totient is φ = 21802855198.

The previous prime is 21802855169. The next prime is 21802855223. The reversal of 21802855199 is 99155820812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21802855199 is a prime.

It is a super-2 number, since 2×21802855199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21802855169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10901427599 + 10901427600.

It is an arithmetic number, because the mean of its divisors is an integer number (10901427600).

Almost surely, 2^21802855199 is an apocalyptic number.

21802855199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21802855199 is an equidigital number, since it uses as much as digits as its factorization.

21802855199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 50.

The spelling of 21802855199 in words is "twenty-one billion, eight hundred two million, eight hundred fifty-five thousand, one hundred ninety-nine".