21933361 has 8 divisors (see below), whose sum is σ = 22657320. Its totient is φ = 21220992.

The previous prime is 21933347. The next prime is 21933377. The reversal of 21933361 is 16333912.

It can be written as a sum of positive squares in 4 ways, for example, as 3400336 + 18533025 = 1844^2 + 4305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21933361 - 2¹¹ = 21931313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21933061) 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 in 7 ways as a sum of consecutive naturals, for example, 1035 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (2832165).

Almost surely, 2^21933361 is an apocalyptic number.

It is an amenable number.

21933361 is a deficient number, since it is larger than the sum of its proper divisors (723959).

21933361 is an equidigital number, since it uses as much as digits as its factorization.

21933361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795.

The product of its digits is 2916, while the sum is 28.

The square root of 21933361 is about 4683.3066310034. The cubic root of 21933361 is about 279.9207301113.

The spelling of 21933361 in words is "twenty-one million, nine hundred thirty-three thousand, three hundred sixty-one".