21267822 has 16 divisors (see below), whose sum is σ = 43685712. Its totient is φ = 6897600.

The previous prime is 21267803. The next prime is 21267823. The reversal of 21267822 is 22876212.

It is a self number, because there is not a number n which added to its sum of digits gives 21267822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21267823) 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, 47679 + ... + 48122.

It is an arithmetic number, because the mean of its divisors is an integer number (2730357).

Almost surely, 2^21267822 is an apocalyptic number.

21267822 is an abundant number, since it is smaller than the sum of its proper divisors (22417890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21267822 is a wasteful number, since it uses less digits than its factorization.

21267822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95843.

The product of its digits is 5376, while the sum is 30.

The square root of 21267822 is about 4611.7048908186. The cubic root of 21267822 is about 277.0603247608.

The spelling of 21267822 in words is "twenty-one million, two hundred sixty-seven thousand, eight hundred twenty-two".