26619221 has 2 divisors, whose sum is σ = 26619222. Its totient is φ = 26619220.

The previous prime is 26619199. The next prime is 26619253. The reversal of 26619221 is 12291662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26522500 + 96721 = 5150^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 26619221 - 2⁶ = 26619157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26619721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13309610 + 13309611.

It is an arithmetic number, because the mean of its divisors is an integer number (13309611).

Almost surely, 2^26619221 is an apocalyptic number.

It is an amenable number.

26619221 is a deficient number, since it is larger than the sum of its proper divisors (1).

26619221 is an equidigital number, since it uses as much as digits as its factorization.

26619221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 26619221 is about 5159.3818428180. The cubic root of 26619221 is about 298.5830252194.

The spelling of 26619221 in words is "twenty-six million, six hundred nineteen thousand, two hundred twenty-one".