21322297 has 2 divisors, whose sum is σ = 21322298. Its totient is φ = 21322296.

The previous prime is 21322291. The next prime is 21322307. The reversal of 21322297 is 79222312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13682601 + 7639696 = 3699^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322297 - 2³ = 21322289 is a prime.

It is a Chen prime.

It is equal to p_1349056 and since 21322297 and 1349056 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 (21322291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661148 + 10661149.

It is an arithmetic number, because the mean of its divisors is an integer number (10661149).

Almost surely, 2^21322297 is an apocalyptic number.

It is an amenable number.

21322297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322297 is an equidigital number, since it uses as much as digits as its factorization.

21322297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 21322297 is about 4617.6072808328. The cubic root of 21322297 is about 277.2966754522.

The spelling of 21322297 in words is "twenty-one million, three hundred twenty-two thousand, two hundred ninety-seven".