21868337 has 2 divisors, whose sum is σ = 21868338. Its totient is φ = 21868336.

The previous prime is 21868333. The next prime is 21868367. The reversal of 21868337 is 73386812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15437041 + 6431296 = 3929^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 21868337 - 2² = 21868333 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21868337.

It is not a weakly prime, because it can be changed into another prime (21868333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10934168 + 10934169.

It is an arithmetic number, because the mean of its divisors is an integer number (10934169).

Almost surely, 2^21868337 is an apocalyptic number.

It is an amenable number.

21868337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21868337 is an equidigital number, since it uses as much as digits as its factorization.

21868337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 21868337 is about 4676.3593745562. The cubic root of 21868337 is about 279.6438371152.

The spelling of 21868337 in words is "twenty-one million, eight hundred sixty-eight thousand, three hundred thirty-seven".