21969267 has 4 divisors (see below), whose sum is σ = 29292360. Its totient is φ = 14646176.

The previous prime is 21969251. The next prime is 21969271. The reversal of 21969267 is 76296912.

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

It is a cyclic number.

It is not a de Polignac number, because 21969267 - 2⁴ = 21969251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21969247) 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, 3661542 + ... + 3661547.

It is an arithmetic number, because the mean of its divisors is an integer number (7323090).

Almost surely, 2^21969267 is an apocalyptic number.

21969267 is a deficient number, since it is larger than the sum of its proper divisors (7323093).

21969267 is an equidigital number, since it uses as much as digits as its factorization.

21969267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7323092.

The product of its digits is 81648, while the sum is 42.

The square root of 21969267 is about 4687.1384660579. The cubic root of 21969267 is about 280.0733948754.

The spelling of 21969267 in words is "twenty-one million, nine hundred sixty-nine thousand, two hundred sixty-seven".