21268297 has 2 divisors, whose sum is σ = 21268298. Its totient is φ = 21268296.

The previous prime is 21268271. The next prime is 21268327. The reversal of 21268297 is 79286212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 5180176 = 4011^2 + 2276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21268297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21268267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10634148 + 10634149.

It is an arithmetic number, because the mean of its divisors is an integer number (10634149).

Almost surely, 2^21268297 is an apocalyptic number.

It is an amenable number.

21268297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21268297 is an equidigital number, since it uses as much as digits as its factorization.

21268297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 21268297 is about 4611.7563899235. The cubic root of 21268297 is about 277.0623873866.

The spelling of 21268297 in words is "twenty-one million, two hundred sixty-eight thousand, two hundred ninety-seven".