21422020099 has 2 divisors, whose sum is σ = 21422020100. Its totient is φ = 21422020098.

The previous prime is 21422020097. The next prime is 21422020141. The reversal of 21422020099 is 99002022412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21422020099 - 2¹ = 21422020097 is a prime.

Together with 21422020097, 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 21422020099.

It is not a weakly prime, because it can be changed into another prime (21422020091) 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 as a sum of consecutive naturals, namely, 10711010049 + 10711010050.

It is an arithmetic number, because the mean of its divisors is an integer number (10711010050).

Almost surely, 2^21422020099 is an apocalyptic number.

21422020099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422020099 is an equidigital number, since it uses as much as digits as its factorization.

21422020099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 21422020099 in words is "twenty-one billion, four hundred twenty-two million, twenty thousand, ninety-nine".