26506221 has 16 divisors (see below), whose sum is σ = 40464384. Its totient is φ = 15118704.

The previous prime is 26506211. The next prime is 26506229. The reversal of 26506221 is 12260562.

It is not a de Polignac number, because 26506221 - 2⁶ = 26506157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26506191 and 26506200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26506229) 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, 17916 + ... + 19338.

It is an arithmetic number, because the mean of its divisors is an integer number (2529024).

Almost surely, 2^26506221 is an apocalyptic number.

26506221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26506221 is a deficient number, since it is larger than the sum of its proper divisors (13958163).

26506221 is a wasteful number, since it uses less digits than its factorization.

26506221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 26506221 is about 5148.4192719708. The cubic root of 26506221 is about 298.1599257194.

Adding to 26506221 its reverse (12260562), we get a palindrome (38766783).

The spelling of 26506221 in words is "twenty-six million, five hundred six thousand, two hundred twenty-one".