26656221 has 16 divisors (see below), whose sum is σ = 39614400. Its totient is φ = 15844608.

The previous prime is 26656219. The next prime is 26656229. The reversal of 26656221 is 12265662.

It is not a de Polignac number, because 26656221 - 2¹ = 26656219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26656229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12786 + ... + 14723.

It is an arithmetic number, because the mean of its divisors is an integer number (2475900).

Almost surely, 2^26656221 is an apocalyptic number.

It is an amenable number.

26656221 is a deficient number, since it is larger than the sum of its proper divisors (12958179).

26656221 is a wasteful number, since it uses less digits than its factorization.

26656221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27548.

The product of its digits is 8640, while the sum is 30.

The square root of 26656221 is about 5162.9662985536. The cubic root of 26656221 is about 298.7213019591.

The spelling of 26656221 in words is "twenty-six million, six hundred fifty-six thousand, two hundred twenty-one".