26897221 has 4 divisors (see below), whose sum is σ = 28966252. Its totient is φ = 24828192.

The previous prime is 26897219. The next prime is 26897237. The reversal of 26897221 is 12279862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3568321 + 23328900 = 1889^2 + 4830^2 .

It is a cyclic number.

It is not a de Polignac number, because 26897221 - 2¹ = 26897219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26897201) 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 in 3 ways as a sum of consecutive naturals, for example, 1034496 + ... + 1034521.

It is an arithmetic number, because the mean of its divisors is an integer number (7241563).

Almost surely, 2^26897221 is an apocalyptic number.

It is an amenable number.

26897221 is a deficient number, since it is larger than the sum of its proper divisors (2069031).

26897221 is a wasteful number, since it uses less digits than its factorization.

26897221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069030.

The product of its digits is 24192, while the sum is 37.

The square root of 26897221 is about 5186.2530790543. The cubic root of 26897221 is about 299.6188529987.

The spelling of 26897221 in words is "twenty-six million, eight hundred ninety-seven thousand, two hundred twenty-one".