26841821 has 2 divisors, whose sum is σ = 26841822. Its totient is φ = 26841820.

The previous prime is 26841809. The next prime is 26841823. The reversal of 26841821 is 12814862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 3667225 = 4814^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 26841821 - 2²² = 22647517 is a prime.

Together with 26841823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26841823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13420910 + 13420911.

It is an arithmetic number, because the mean of its divisors is an integer number (13420911).

Almost surely, 2^26841821 is an apocalyptic number.

It is an amenable number.

26841821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26841821 is an equidigital number, since it uses as much as digits as its factorization.

26841821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 32.

The square root of 26841821 is about 5180.9092831278. The cubic root of 26841821 is about 299.4130040535.

The spelling of 26841821 in words is "twenty-six million, eight hundred forty-one thousand, eight hundred twenty-one".