21998341 has 2 divisors, whose sum is σ = 21998342. Its totient is φ = 21998340.

The previous prime is 21998321. The next prime is 21998359. The reversal of 21998341 is 14389912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15602500 + 6395841 = 3950^2 + 2529^2 .

It is a cyclic number.

It is not a de Polignac number, because 21998341 - 2⁵ = 21998309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21998341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21998321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10999170 + 10999171.

It is an arithmetic number, because the mean of its divisors is an integer number (10999171).

Almost surely, 2^21998341 is an apocalyptic number.

It is an amenable number.

21998341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21998341 is an equidigital number, since it uses as much as digits as its factorization.

21998341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 21998341 is about 4690.2389064951. The cubic root of 21998341 is about 280.1968895805.

The spelling of 21998341 in words is "twenty-one million, nine hundred ninety-eight thousand, three hundred forty-one".