26921921 has 8 divisors (see below), whose sum is σ = 29041320. Its totient is φ = 24809472.

The previous prime is 26921893. The next prime is 26921957. The reversal of 26921921 is 12912962.

It can be written as a sum of positive squares in 4 ways, for example, as 255025 + 26666896 = 505^2 + 5164^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26921921 - 2¹⁰ = 26920897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26921021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8651 + ... + 11343.

It is an arithmetic number, because the mean of its divisors is an integer number (3630165).

Almost surely, 2^26921921 is an apocalyptic number.

It is an amenable number.

26921921 is a deficient number, since it is larger than the sum of its proper divisors (2119399).

26921921 is a wasteful number, since it uses less digits than its factorization.

26921921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3475.

The product of its digits is 3888, while the sum is 32.

The square root of 26921921 is about 5188.6338278973. The cubic root of 26921921 is about 299.7105393167.

The spelling of 26921921 in words is "twenty-six million, nine hundred twenty-one thousand, nine hundred twenty-one".