26218121 has 4 divisors (see below), whose sum is σ = 26229012. Its totient is φ = 26207232.

The previous prime is 26218079. The next prime is 26218133. The reversal of 26218121 is 12181262.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8620096 + 17598025 = 2936^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 26218121 - 2¹⁰ = 26217097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26218141) 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, 56 + ... + 7241.

It is an arithmetic number, because the mean of its divisors is an integer number (6557253).

Almost surely, 2^26218121 is an apocalyptic number.

It is an amenable number.

26218121 is a deficient number, since it is larger than the sum of its proper divisors (10891).

26218121 is an equidigital number, since it uses as much as digits as its factorization.

26218121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10890.

The product of its digits is 384, while the sum is 23.

The square root of 26218121 is about 5120.3633660122. The cubic root of 26218121 is about 297.0757401485.

Adding to 26218121 its reverse (12181262), we get a palindrome (38399383).

The spelling of 26218121 in words is "twenty-six million, two hundred eighteen thousand, one hundred twenty-one".