21133283 has 2 divisors, whose sum is σ = 21133284. Its totient is φ = 21133282.

The previous prime is 21133243. The next prime is 21133291. The reversal of 21133283 is 38233112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21133283 - 2⁶ = 21133219 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21133213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566641 + 10566642.

It is an arithmetic number, because the mean of its divisors is an integer number (10566642).

Almost surely, 2^21133283 is an apocalyptic number.

21133283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133283 is an equidigital number, since it uses as much as digits as its factorization.

21133283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 21133283 is about 4597.0950610141. The cubic root of 21133283 is about 276.4748660155.

Adding to 21133283 its reverse (38233112), we get a palindrome (59366395).

The spelling of 21133283 in words is "twenty-one million, one hundred thirty-three thousand, two hundred eighty-three".