26821321 has 2 divisors, whose sum is σ = 26821322. Its totient is φ = 26821320.

The previous prime is 26821309. The next prime is 26821439. The reversal of 26821321 is 12312862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25644096 + 1177225 = 5064^2 + 1085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26821321 is a prime.

It is not a weakly prime, because it can be changed into another prime (26827321) 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 as a sum of consecutive naturals, namely, 13410660 + 13410661.

It is an arithmetic number, because the mean of its divisors is an integer number (13410661).

Almost surely, 2^26821321 is an apocalyptic number.

It is an amenable number.

26821321 is a deficient number, since it is larger than the sum of its proper divisors (1).

26821321 is an equidigital number, since it uses as much as digits as its factorization.

26821321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 26821321 is about 5178.9304880448. The cubic root of 26821321 is about 299.3367607187.

The spelling of 26821321 in words is "twenty-six million, eight hundred twenty-one thousand, three hundred twenty-one".