21443363 has 2 divisors, whose sum is σ = 21443364. Its totient is φ = 21443362.

The previous prime is 21443339. The next prime is 21443431. The reversal of 21443363 is 36334412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21443363 - 2¹⁶ = 21377827 is a prime.

It is not a weakly prime, because it can be changed into another prime (21443333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721681 + 10721682.

It is an arithmetic number, because the mean of its divisors is an integer number (10721682).

Almost surely, 2^21443363 is an apocalyptic number.

21443363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443363 is an equidigital number, since it uses as much as digits as its factorization.

21443363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 26.

The square root of 21443363 is about 4630.6978955661. The cubic root of 21443363 is about 277.8205067721.

Adding to 21443363 its reverse (36334412), we get a palindrome (57777775).

The spelling of 21443363 in words is "twenty-one million, four hundred forty-three thousand, three hundred sixty-three".