26911921 has 4 divisors (see below), whose sum is σ = 26928244. Its totient is φ = 26895600.

The previous prime is 26911889. The next prime is 26911931. The reversal of 26911921 is 12911962.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 440896 + 26471025 = 664^2 + 5145^2 .

It is a cyclic number.

It is not a de Polignac number, because 26911921 - 2⁵ = 26911889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26911931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5370 + ... + 9091.

It is an arithmetic number, because the mean of its divisors is an integer number (6732061).

Almost surely, 2^26911921 is an apocalyptic number.

It is an amenable number.

26911921 is a deficient number, since it is larger than the sum of its proper divisors (16323).

26911921 is a wasteful number, since it uses less digits than its factorization.

26911921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16322.

The product of its digits is 1944, while the sum is 31.

The square root of 26911921 is about 5187.6700935969. The cubic root of 26911921 is about 299.6734261088.

The spelling of 26911921 in words is "twenty-six million, nine hundred eleven thousand, nine hundred twenty-one".