21042283 has 2 divisors, whose sum is σ = 21042284. Its totient is φ = 21042282.

The previous prime is 21042251. The next prime is 21042289. The reversal of 21042283 is 38224012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21042283 - 2⁵ = 21042251 is a prime.

It is equal to p_1332490 and since 21042283 and 1332490 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21042289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521141 + 10521142.

It is an arithmetic number, because the mean of its divisors is an integer number (10521142).

Almost surely, 2^21042283 is an apocalyptic number.

21042283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21042283 is an equidigital number, since it uses as much as digits as its factorization.

21042283 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21042283 is about 4587.1868285475. The cubic root of 21042283 is about 276.0774611048.

Adding to 21042283 its reverse (38224012), we get a palindrome (59266295).

The spelling of 21042283 in words is "twenty-one million, forty-two thousand, two hundred eighty-three".