26221229 has 2 divisors, whose sum is σ = 26221230. Its totient is φ = 26221228.

The previous prime is 26221199. The next prime is 26221231. The reversal of 26221229 is 92212262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24255625 + 1965604 = 4925^2 + 1402^2 .

It is a cyclic number.

It is not a de Polignac number, because 26221229 - 2⁸ = 26220973 is a prime.

Together with 26221231, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 26221198 and 26221207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26251229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110614 + 13110615.

It is an arithmetic number, because the mean of its divisors is an integer number (13110615).

Almost surely, 2^26221229 is an apocalyptic number.

It is an amenable number.

26221229 is a deficient number, since it is larger than the sum of its proper divisors (1).

26221229 is an equidigital number, since it uses as much as digits as its factorization.

26221229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 26221229 is about 5120.6668511045. Note that the first 3 decimals coincide. The cubic root of 26221229 is about 297.0874785300.

The spelling of 26221229 in words is "twenty-six million, two hundred twenty-one thousand, two hundred twenty-nine".