26042721 has 4 divisors (see below), whose sum is σ = 34723632. Its totient is φ = 17361812.

The previous prime is 26042713. The next prime is 26042743. The reversal of 26042721 is 12724062.

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 a cyclic number.

It is not a de Polignac number, because 26042721 - 2³ = 26042713 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 26042691 and 26042700.

It is not an unprimeable number, because it can be changed into a prime (26042761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4340451 + ... + 4340456.

It is an arithmetic number, because the mean of its divisors is an integer number (8680908).

Almost surely, 2^26042721 is an apocalyptic number.

It is an amenable number.

26042721 is a deficient number, since it is larger than the sum of its proper divisors (8680911).

26042721 is an equidigital number, since it uses as much as digits as its factorization.

26042721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8680910.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 26042721 is about 5103.2069329001. The cubic root of 26042721 is about 296.4117754814.

Adding to 26042721 its reverse (12724062), we get a palindrome (38766783).

The spelling of 26042721 in words is "twenty-six million, forty-two thousand, seven hundred twenty-one".