26821313 has 4 divisors (see below), whose sum is σ = 26835120. Its totient is φ = 26807508.

The previous prime is 26821309. The next prime is 26821321. The reversal of 26821313 is 31312862.

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 26821313 - 2² = 26821309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26841313) 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, 3395 + ... + 8072.

It is an arithmetic number, because the mean of its divisors is an integer number (6708780).

Almost surely, 2^26821313 is an apocalyptic number.

It is an amenable number.

26821313 is a deficient number, since it is larger than the sum of its proper divisors (13807).

26821313 is a wasteful number, since it uses less digits than its factorization.

26821313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13806.

The product of its digits is 1728, while the sum is 26.

The square root of 26821313 is about 5178.9297156845. The cubic root of 26821313 is about 299.3367309576.

The spelling of 26821313 in words is "twenty-six million, eight hundred twenty-one thousand, three hundred thirteen".