26221669 has 4 divisors (see below), whose sum is σ = 26388844. Its totient is φ = 26054496.

The previous prime is 26221661. The next prime is 26221681. The reversal of 26221669 is 96612262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96612262 = 2 ⋅48306131.

It can be written as a sum of positive squares in 2 ways, for example, as 14062500 + 12159169 = 3750^2 + 3487^2 .

It is a cyclic number.

It is not a de Polignac number, because 26221669 - 2³ = 26221661 is a prime.

It is a super-2 number, since 2×26221669² = 1375151850291122, 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 (26221661) 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, 83352 + ... + 83665.

It is an arithmetic number, because the mean of its divisors is an integer number (6597211).

Almost surely, 2^26221669 is an apocalyptic number.

It is an amenable number.

26221669 is a deficient number, since it is larger than the sum of its proper divisors (167175).

26221669 is a wasteful number, since it uses less digits than its factorization.

26221669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167174.

The product of its digits is 15552, while the sum is 34.

The square root of 26221669 is about 5120.7098140785. The cubic root of 26221669 is about 297.0891402594.

The spelling of 26221669 in words is "twenty-six million, two hundred twenty-one thousand, six hundred sixty-nine".