26430021 has 12 divisors (see below), whose sum is σ = 38225772. Its totient is φ = 17597376.

The previous prime is 26429971. The next prime is 26430023. The reversal of 26430021 is 12003462.

It is a happy number.

26430021 is a `hidden beast` number, since 2 + 643 + 0 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3101121 + 23328900 = 1761^2 + 4830^2 .

It is not a de Polignac number, because 26430021 - 2⁶ = 26429957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26429976 and 26430003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26430023) 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 11 ways as a sum of consecutive naturals, for example, 8535 + ... + 11211.

It is an arithmetic number, because the mean of its divisors is an integer number (3185481).

Almost surely, 2^26430021 is an apocalyptic number.

It is an amenable number.

26430021 is a deficient number, since it is larger than the sum of its proper divisors (11795751).

26430021 is a wasteful number, since it uses less digits than its factorization.

26430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780 (or 3777 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 26430021 is about 5141.0136160100. The cubic root of 26430021 is about 297.8739350864.

Adding to 26430021 its reverse (12003462), we get a palindrome (38433483).

The spelling of 26430021 in words is "twenty-six million, four hundred thirty thousand, twenty-one".