26000021 has 4 divisors (see below), whose sum is σ = 27529452. Its totient is φ = 24470592.

The previous prime is 26000017. The next prime is 26000033. The reversal of 26000021 is 12000062.

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 12859396 + 13140625 = 3586^2 + 3625^2 .

It is a cyclic number.

It is not a de Polignac number, because 26000021 - 2² = 26000017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25999966 and 26000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26000081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764690 + ... + 764723.

It is an arithmetic number, because the mean of its divisors is an integer number (6882363).

Almost surely, 2^26000021 is an apocalyptic number.

It is an amenable number.

26000021 is a deficient number, since it is larger than the sum of its proper divisors (1529431).

26000021 is a wasteful number, since it uses less digits than its factorization.

26000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529430.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 26000021 is about 5099.0215728118. The cubic root of 26000021 is about 296.2496866002.

Adding to 26000021 its reverse (12000062), we get a palindrome (38000083).

The spelling of 26000021 in words is "twenty-six million, twenty-one", and thus it is an aban number and an uban number.