21916337 has 2 divisors, whose sum is σ = 21916338. Its totient is φ = 21916336.

The previous prime is 21916333. The next prime is 21916343. The reversal of 21916337 is 73361912.

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., 21077281 + 839056 = 4591^2 + 916^2 .

It is a cyclic number.

It is not a de Polignac number, because 21916337 - 2² = 21916333 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21916331) 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, 10958168 + 10958169.

It is an arithmetic number, because the mean of its divisors is an integer number (10958169).

Almost surely, 2^21916337 is an apocalyptic number.

It is an amenable number.

21916337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21916337 is an equidigital number, since it uses as much as digits as its factorization.

21916337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 32.

The square root of 21916337 is about 4681.4887589313. The cubic root of 21916337 is about 279.8482894131.

The spelling of 21916337 in words is "twenty-one million, nine hundred sixteen thousand, three hundred thirty-seven".