21676297 has 2 divisors, whose sum is σ = 21676298. Its totient is φ = 21676296.

The previous prime is 21676279. The next prime is 21676301. The reversal of 21676297 is 79267612.

Together with previous prime (21676279) 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., 21566736 + 109561 = 4644^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 21676297 - 2¹¹ = 21674249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21671297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10838148 + 10838149.

It is an arithmetic number, because the mean of its divisors is an integer number (10838149).

Almost surely, 2^21676297 is an apocalyptic number.

It is an amenable number.

21676297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21676297 is an equidigital number, since it uses as much as digits as its factorization.

21676297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 21676297 is about 4655.7810300743. The cubic root of 21676297 is about 278.8228514500.

It can be divided in two parts, 2167 and 6297, that added together give a square (8464 = 92²).

The spelling of 21676297 in words is "twenty-one million, six hundred seventy-six thousand, two hundred ninety-seven".