21167297 has 2 divisors, whose sum is σ = 21167298. Its totient is φ = 21167296.

The previous prime is 21167257. The next prime is 21167317. The reversal of 21167297 is 79276112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15555136 + 5612161 = 3944^2 + 2369^2 .

It is a cyclic number.

It is not a de Polignac number, because 21167297 - 2⁶ = 21167233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21167257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10583648 + 10583649.

It is an arithmetic number, because the mean of its divisors is an integer number (10583649).

Almost surely, 2^21167297 is an apocalyptic number.

It is an amenable number.

21167297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21167297 is an equidigital number, since it uses as much as digits as its factorization.

21167297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 21167297 is about 4600.7930838063. The cubic root of 21167297 is about 276.6231151911.

The spelling of 21167297 in words is "twenty-one million, one hundred sixty-seven thousand, two hundred ninety-seven".