26316421 has 4 divisors (see below), whose sum is σ = 26329644. Its totient is φ = 26303200.

The previous prime is 26316379. The next prime is 26316443. The reversal of 26316421 is 12461362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12461362 = 2 ⋅6230681.

It can be written as a sum of positive squares in 2 ways, for example, as 4796100 + 21520321 = 2190^2 + 4639^2 .

It is a cyclic number.

It is not a de Polignac number, because 26316421 - 2⁹ = 26315909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26316481) 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 in 3 ways as a sum of consecutive naturals, for example, 2950 + ... + 7831.

It is an arithmetic number, because the mean of its divisors is an integer number (6582411).

Almost surely, 2^26316421 is an apocalyptic number.

It is an amenable number.

26316421 is a deficient number, since it is larger than the sum of its proper divisors (13223).

26316421 is a wasteful number, since it uses less digits than its factorization.

26316421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13222.

The product of its digits is 1728, while the sum is 25.

The square root of 26316421 is about 5129.9533136277. The cubic root of 26316421 is about 297.4465539656.

Adding to 26316421 its reverse (12461362), we get a palindrome (38777783).

The spelling of 26316421 in words is "twenty-six million, three hundred sixteen thousand, four hundred twenty-one".