26209221 has 16 divisors (see below), whose sum is σ = 35954688. Its totient is φ = 16974000.

The previous prime is 26209201. The next prime is 26209241. The reversal of 26209221 is 12290262.

It is an interprime number because it is at equal distance from previous prime (26209201) and next prime (26209241).

It is not a de Polignac number, because 26209221 - 2¹⁰ = 26208197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26209191 and 26209200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26209201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20676 + ... + 21906.

It is an arithmetic number, because the mean of its divisors is an integer number (2247168).

Almost surely, 2^26209221 is an apocalyptic number.

It is an amenable number.

26209221 is a deficient number, since it is larger than the sum of its proper divisors (9745467).

26209221 is a wasteful number, since it uses less digits than its factorization.

26209221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 26209221 is about 5119.4942132988. The cubic root of 26209221 is about 297.0421212466.

Adding to 26209221 its reverse (12290262), we get a palindrome (38499483).

The spelling of 26209221 in words is "twenty-six million, two hundred nine thousand, two hundred twenty-one".