26940021 has 4 divisors (see below), whose sum is σ = 35920032. Its totient is φ = 17960012.

The previous prime is 26939999. The next prime is 26940029. The reversal of 26940021 is 12004962.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26940021 - 2⁵ = 26939989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26939973 and 26940000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26940029) 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 3 ways as a sum of consecutive naturals, for example, 4490001 + ... + 4490006.

It is an arithmetic number, because the mean of its divisors is an integer number (8980008).

Almost surely, 2^26940021 is an apocalyptic number.

It is an amenable number.

26940021 is a deficient number, since it is larger than the sum of its proper divisors (8980011).

26940021 is an equidigital number, since it uses as much as digits as its factorization.

26940021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8980010.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 26940021 is about 5190.3777319189. The cubic root of 26940021 is about 299.7776908584. Note that the first 3 decimals are identical.

Adding to 26940021 its reverse (12004962), we get a palindrome (38944983).

The spelling of 26940021 in words is "twenty-six million, nine hundred forty thousand, twenty-one".