26221213 has 4 divisors (see below), whose sum is σ = 26257248. Its totient is φ = 26185180.

The previous prime is 26221199. The next prime is 26221229. The reversal of 26221213 is 31212262.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31212262 = 2 ⋅15606131.

It is a cyclic number.

It is not a de Polignac number, because 26221213 - 2¹³ = 26213021 is a prime.

It is a super-2 number, since 2×26221213² = 1375104022382738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26221513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16903 + ... + 18388.

It is an arithmetic number, because the mean of its divisors is an integer number (6564312).

Almost surely, 2^26221213 is an apocalyptic number.

It is an amenable number.

26221213 is a deficient number, since it is larger than the sum of its proper divisors (36035).

26221213 is an equidigital number, since it uses as much as digits as its factorization.

26221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36034.

The product of its digits is 288, while the sum is 19.

The square root of 26221213 is about 5120.6652888077. The cubic root of 26221213 is about 297.0874181031.

Adding to 26221213 its reverse (31212262), we get a palindrome (57433475).

The spelling of 26221213 in words is "twenty-six million, two hundred twenty-one thousand, two hundred thirteen".