26136221 has 4 divisors (see below), whose sum is σ = 27037500. Its totient is φ = 25234944.

The previous prime is 26136199. The next prime is 26136223. The reversal of 26136221 is 12263162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9211225 + 16924996 = 3035^2 + 4114^2 .

It is a cyclic number.

It is not a de Polignac number, because 26136221 - 2¹⁸ = 25874077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26136223) 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, 450596 + ... + 450653.

It is an arithmetic number, because the mean of its divisors is an integer number (6759375).

Almost surely, 2^26136221 is an apocalyptic number.

It is an amenable number.

26136221 is a deficient number, since it is larger than the sum of its proper divisors (901279).

26136221 is an equidigital number, since it uses as much as digits as its factorization.

26136221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901278.

The product of its digits is 864, while the sum is 23.

The square root of 26136221 is about 5112.3596313249. The cubic root of 26136221 is about 296.7660830521.

Adding to 26136221 its reverse (12263162), we get a palindrome (38399383).

The spelling of 26136221 in words is "twenty-six million, one hundred thirty-six thousand, two hundred twenty-one".