26371621 has 2 divisors, whose sum is σ = 26371622. Its totient is φ = 26371620.

The previous prime is 26371619. The next prime is 26371633. The reversal of 26371621 is 12617362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 980100 = 5039^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 26371621 - 2¹ = 26371619 is a prime.

Together with 26371619, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26371621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26371661) 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, 13185810 + 13185811.

It is an arithmetic number, because the mean of its divisors is an integer number (13185811).

Almost surely, 2^26371621 is an apocalyptic number.

It is an amenable number.

26371621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26371621 is an equidigital number, since it uses as much as digits as its factorization.

26371621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 26371621 is about 5135.3306612136. The cubic root of 26371621 is about 297.6543783656.

Adding to 26371621 its reverse (12617362), we get a palindrome (38988983).

The spelling of 26371621 in words is "twenty-six million, three hundred seventy-one thousand, six hundred twenty-one".