26220221 has 4 divisors (see below), whose sum is σ = 26263200. Its totient is φ = 26177244.

The previous prime is 26220211. The next prime is 26220223. The reversal of 26220221 is 12202262.

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.

It is a cyclic number.

It is not a de Polignac number, because 26220221 - 2⁶ = 26220157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26220223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20561 + ... + 21798.

It is an arithmetic number, because the mean of its divisors is an integer number (6565800).

Almost surely, 2^26220221 is an apocalyptic number.

It is an amenable number.

26220221 is a deficient number, since it is larger than the sum of its proper divisors (42979).

26220221 is an equidigital number, since it uses as much as digits as its factorization.

26220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42978.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 26220221 is about 5120.5684254778. The cubic root of 26220221 is about 297.0836715890.

Adding to 26220221 its reverse (12202262), we get a palindrome (38422483).

The spelling of 26220221 in words is "twenty-six million, two hundred twenty thousand, two hundred twenty-one".