26669921 has 4 divisors (see below), whose sum is σ = 26906052. Its totient is φ = 26433792.

The previous prime is 26669917. The next prime is 26669969. The reversal of 26669921 is 12996662.

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 547600 + 26122321 = 740^2 + 5111^2 .

It is a cyclic number.

It is not a de Polignac number, because 26669921 - 2² = 26669917 is a prime.

It is a super-2 number, since 2×26669921² = 1422569372292482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26669911) 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, 117896 + ... + 118121.

It is an arithmetic number, because the mean of its divisors is an integer number (6726513).

Almost surely, 2^26669921 is an apocalyptic number.

It is an amenable number.

26669921 is a deficient number, since it is larger than the sum of its proper divisors (236131).

26669921 is a wasteful number, since it uses less digits than its factorization.

26669921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236130.

The product of its digits is 69984, while the sum is 41.

The square root of 26669921 is about 5164.2928848004. The cubic root of 26669921 is about 298.7724692635.

The spelling of 26669921 in words is "twenty-six million, six hundred sixty-nine thousand, nine hundred twenty-one".