21274283 has 2 divisors, whose sum is σ = 21274284. Its totient is φ = 21274282.

The previous prime is 21274261. The next prime is 21274289. The reversal of 21274283 is 38247212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21274283 - 2⁶ = 21274219 is a prime.

It is a Sophie Germain prime.

It is equal to p_1346186 and since 21274283 and 1346186 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 (21274289) 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, 10637141 + 10637142.

It is an arithmetic number, because the mean of its divisors is an integer number (10637142).

Almost surely, 2^21274283 is an apocalyptic number.

21274283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21274283 is an equidigital number, since it uses as much as digits as its factorization.

21274283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 21274283 is about 4612.4053377820. The cubic root of 21274283 is about 277.0883781822.

The spelling of 21274283 in words is "twenty-one million, two hundred seventy-four thousand, two hundred eighty-three".