26218221 has 8 divisors (see below), whose sum is σ = 34990080. Its totient is φ = 17462592.

The previous prime is 26218187. The next prime is 26218223. The reversal of 26218221 is 12281262.

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

It is not a de Polignac number, because 26218221 - 2¹⁹ = 25693933 is a prime.

It is a super-2 number, since 2×26218221² = 1374790224809682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26218191 and 26218200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26218223) 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, 421 + ... + 7253.

It is an arithmetic number, because the mean of its divisors is an integer number (4373760).

Almost surely, 2^26218221 is an apocalyptic number.

It is an amenable number.

26218221 is a deficient number, since it is larger than the sum of its proper divisors (8771859).

26218221 is a wasteful number, since it uses less digits than its factorization.

26218221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8115.

The product of its digits is 768, while the sum is 24.

The square root of 26218221 is about 5120.3731309349. The cubic root of 26218221 is about 297.0761178458.

Adding to 26218221 its reverse (12281262), we get a palindrome (38499483).

The spelling of 26218221 in words is "twenty-six million, two hundred eighteen thousand, two hundred twenty-one".