26661121 has 4 divisors (see below), whose sum is σ = 27580500. Its totient is φ = 25741744.

The previous prime is 26661101. The next prime is 26661137. The reversal of 26661121 is 12116662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12116662 = 2 ⋅6058331.

It can be written as a sum of positive squares in 2 ways, for example, as 11730625 + 14930496 = 3425^2 + 3864^2 .

It is a cyclic number.

It is not a de Polignac number, because 26661121 - 2⁷ = 26660993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26661101) 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, 459646 + ... + 459703.

It is an arithmetic number, because the mean of its divisors is an integer number (6895125).

Almost surely, 2^26661121 is an apocalyptic number.

It is an amenable number.

26661121 is a deficient number, since it is larger than the sum of its proper divisors (919379).

26661121 is an equidigital number, since it uses as much as digits as its factorization.

26661121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919378.

The product of its digits is 864, while the sum is 25.

The square root of 26661121 is about 5163.4408101575. The cubic root of 26661121 is about 298.7396046872.

Adding to 26661121 its reverse (12116662), we get a palindrome (38777783).

The spelling of 26661121 in words is "twenty-six million, six hundred sixty-one thousand, one hundred twenty-one".