21814922 has 4 divisors (see below), whose sum is σ = 32722386. Its totient is φ = 10907460.

The previous prime is 21814913. The next prime is 21814951. The reversal of 21814922 is 22941812.

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

It can be written as a sum of positive squares in only one way, i.e., 16801801 + 5013121 = 4099^2 + 2239^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5453729 + ... + 5453732.

Almost surely, 2^21814922 is an apocalyptic number.

21814922 is a deficient number, since it is larger than the sum of its proper divisors (10907464).

21814922 is a wasteful number, since it uses less digits than its factorization.

21814922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10907463.

The product of its digits is 2304, while the sum is 29.

The square root of 21814922 is about 4670.6447092452. The cubic root of 21814922 is about 279.4159680306.

The spelling of 21814922 in words is "twenty-one million, eight hundred fourteen thousand, nine hundred twenty-two".