21967333 has 2 divisors, whose sum is σ = 21967334. Its totient is φ = 21967332.

The previous prime is 21967331. The next prime is 21967343. The reversal of 21967333 is 33376912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20412324 + 1555009 = 4518^2 + 1247^2 .

It is a cyclic number.

It is not a de Polignac number, because 21967333 - 2¹ = 21967331 is a prime.

Together with 21967331, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21967331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10983666 + 10983667.

It is an arithmetic number, because the mean of its divisors is an integer number (10983667).

Almost surely, 2^21967333 is an apocalyptic number.

It is an amenable number.

21967333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21967333 is an equidigital number, since it uses as much as digits as its factorization.

21967333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 34.

The square root of 21967333 is about 4686.9321522719. The cubic root of 21967333 is about 280.0651761542.

The spelling of 21967333 in words is "twenty-one million, nine hundred sixty-seven thousand, three hundred thirty-three".