21466297 has 2 divisors, whose sum is σ = 21466298. Its totient is φ = 21466296.

The previous prime is 21466279. The next prime is 21466349. The reversal of 21466297 is 79266412.

Together with previous prime (21466279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19855936 + 1610361 = 4456^2 + 1269^2 .

It is a cyclic number.

It is not a de Polignac number, because 21466297 - 2¹¹ = 21464249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21466097) 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, 10733148 + 10733149.

It is an arithmetic number, because the mean of its divisors is an integer number (10733149).

Almost surely, 2^21466297 is an apocalyptic number.

It is an amenable number.

21466297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21466297 is an equidigital number, since it uses as much as digits as its factorization.

21466297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 21466297 is about 4633.1735344146. The cubic root of 21466297 is about 277.9195158900.

The spelling of 21466297 in words is "twenty-one million, four hundred sixty-six thousand, two hundred ninety-seven".