21154283 has 2 divisors, whose sum is σ = 21154284. Its totient is φ = 21154282.

The previous prime is 21154207. The next prime is 21154339. The reversal of 21154283 is 38245112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21154283 - 2⁸ = 21154027 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21154583) 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, 10577141 + 10577142.

It is an arithmetic number, because the mean of its divisors is an integer number (10577142).

Almost surely, 2^21154283 is an apocalyptic number.

21154283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154283 is an equidigital number, since it uses as much as digits as its factorization.

21154283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 26.

The square root of 21154283 is about 4599.3785449776. The cubic root of 21154283 is about 276.5664127656.

Adding to 21154283 its reverse (38245112), we get a palindrome (59399395).

The spelling of 21154283 in words is "twenty-one million, one hundred fifty-four thousand, two hundred eighty-three".