26109921 has 4 divisors (see below), whose sum is σ = 34813232. Its totient is φ = 17406612.

The previous prime is 26109917. The next prime is 26109929. The reversal of 26109921 is 12990162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 26109921 - 2² = 26109917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26109929) 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, 4351651 + ... + 4351656.

It is an arithmetic number, because the mean of its divisors is an integer number (8703308).

Almost surely, 2^26109921 is an apocalyptic number.

It is an amenable number.

26109921 is a deficient number, since it is larger than the sum of its proper divisors (8703311).

26109921 is an equidigital number, since it uses as much as digits as its factorization.

26109921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8703310.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 26109921 is about 5109.7867861585. The cubic root of 26109921 is about 296.6665077360. Note that the first 3 decimals are identical.

The spelling of 26109921 in words is "twenty-six million, one hundred nine thousand, nine hundred twenty-one".