21254297 has 2 divisors, whose sum is σ = 21254298. Its totient is φ = 21254296.

The previous prime is 21254279. The next prime is 21254309. The reversal of 21254297 is 79245212.

Together with previous prime (21254279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 633616 = 4541^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 21254297 - 2⁸ = 21254041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21254227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627148 + 10627149.

It is an arithmetic number, because the mean of its divisors is an integer number (10627149).

Almost surely, 2^21254297 is an apocalyptic number.

It is an amenable number.

21254297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254297 is an equidigital number, since it uses as much as digits as its factorization.

21254297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 21254297 is about 4610.2382801760. The cubic root of 21254297 is about 277.0015813140.

The spelling of 21254297 in words is "twenty-one million, two hundred fifty-four thousand, two hundred ninety-seven".