26830921 has 4 divisors (see below), whose sum is σ = 28894852. Its totient is φ = 24766992.

The previous prime is 26830901. The next prime is 26830939. The reversal of 26830921 is 12903862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12903862 = 2 ⋅6451931.

It can be written as a sum of positive squares in 2 ways, for example, as 5569600 + 21261321 = 2360^2 + 4611^2 .

It is a cyclic number.

It is not a de Polignac number, because 26830921 - 2¹³ = 26822729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26830901) 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, 1031946 + ... + 1031971.

It is an arithmetic number, because the mean of its divisors is an integer number (7223713).

Almost surely, 2^26830921 is an apocalyptic number.

It is an amenable number.

26830921 is a deficient number, since it is larger than the sum of its proper divisors (2063931).

26830921 is a wasteful number, since it uses less digits than its factorization.

26830921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063930.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 26830921 is about 5179.8572374149. The cubic root of 26830921 is about 299.3724697493.

It can be divided in two parts, 268 and 30921, that multiplied together give a palindrome (8286828).

The spelling of 26830921 in words is "twenty-six million, eight hundred thirty thousand, nine hundred twenty-one".