21023383 has 2 divisors, whose sum is σ = 21023384. Its totient is φ = 21023382.

The previous prime is 21023381. The next prime is 21023393. The reversal of 21023383 is 38332012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21023383 - 2¹ = 21023381 is a prime.

Together with 21023381, 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 (21023381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511691 + 10511692.

It is an arithmetic number, because the mean of its divisors is an integer number (10511692).

Almost surely, 2^21023383 is an apocalyptic number.

21023383 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023383 is an equidigital number, since it uses as much as digits as its factorization.

21023383 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21023383 is about 4585.1262796132. The cubic root of 21023383 is about 275.9947795344.

Adding to 21023383 its reverse (38332012), we get a palindrome (59355395).

The spelling of 21023383 in words is "twenty-one million, twenty-three thousand, three hundred eighty-three".