26216221 has 8 divisors (see below), whose sum is σ = 26514488. Its totient is φ = 25920000.

The previous prime is 26216213. The next prime is 26216231. The reversal of 26216221 is 12261262.

It can be written as a sum of positive squares in 4 ways, for example, as 3463321 + 22752900 = 1861^2 + 4770^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(26216221) divides (26216221-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 26216221 - 2³ = 26216213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26216192 and 26216201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26216231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43321 + ... + 43921.

It is an arithmetic number, because the mean of its divisors is an integer number (3314311).

Almost surely, 2^26216221 is an apocalyptic number.

It is an amenable number.

26216221 is a deficient number, since it is larger than the sum of its proper divisors (298267).

26216221 is a wasteful number, since it uses less digits than its factorization.

26216221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its digits is 576, while the sum is 22.

The square root of 26216221 is about 5120.1778289431. The cubic root of 26216221 is about 297.0685637184.

Adding to 26216221 its reverse (12261262), we get a palindrome (38477483).

The spelling of 26216221 in words is "twenty-six million, two hundred sixteen thousand, two hundred twenty-one".