21228481199 has 2 divisors, whose sum is σ = 21228481200. Its totient is φ = 21228481198.

The previous prime is 21228481171. The next prime is 21228481237. The reversal of 21228481199 is 99118482212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21228481199 - 2²⁰ = 21227432623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21228481999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10614240599 + 10614240600.

It is an arithmetic number, because the mean of its divisors is an integer number (10614240600).

Almost surely, 2^21228481199 is an apocalyptic number.

21228481199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21228481199 is an equidigital number, since it uses as much as digits as its factorization.

21228481199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 47.

The spelling of 21228481199 in words is "twenty-one billion, two hundred twenty-eight million, four hundred eighty-one thousand, one hundred ninety-nine".