21294283 has 2 divisors, whose sum is σ = 21294284. Its totient is φ = 21294282.

The previous prime is 21294271. The next prime is 21294289. The reversal of 21294283 is 38249212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21294283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21294289) 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 as a sum of consecutive naturals, namely, 10647141 + 10647142.

It is an arithmetic number, because the mean of its divisors is an integer number (10647142).

Almost surely, 2^21294283 is an apocalyptic number.

21294283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21294283 is an equidigital number, since it uses as much as digits as its factorization.

21294283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 21294283 is about 4614.5728946458. The cubic root of 21294283 is about 277.1751814501.

The spelling of 21294283 in words is "twenty-one million, two hundred ninety-four thousand, two hundred eighty-three".