21267430 has 16 divisors (see below), whose sum is σ = 38337264. Its totient is φ = 8494560.

The previous prime is 21267401. The next prime is 21267437. The reversal of 21267430 is 3476212.

It is a junction number, because it is equal to n+sod(n) for n = 21267395 and 21267404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21267437) 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 7 ways as a sum of consecutive naturals, for example, 9169 + ... + 11251.

It is an arithmetic number, because the mean of its divisors is an integer number (2396079).

Almost surely, 2^21267430 is an apocalyptic number.

21267430 is a deficient number, since it is larger than the sum of its proper divisors (17069834).

21267430 is a wasteful number, since it uses less digits than its factorization.

21267430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21267430 is about 4611.6623900715. The cubic root of 21267430 is about 277.0586225286.

The spelling of 21267430 in words is "twenty-one million, two hundred sixty-seven thousand, four hundred thirty".