21826822 has 4 divisors (see below), whose sum is σ = 32740236. Its totient is φ = 10913410.

The previous prime is 21826817. The next prime is 21826829. The reversal of 21826822 is 22862812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21826829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5456704 + ... + 5456707.

It is an arithmetic number, because the mean of its divisors is an integer number (8185059).

Almost surely, 2^21826822 is an apocalyptic number.

21826822 is a deficient number, since it is larger than the sum of its proper divisors (10913414).

21826822 is a wasteful number, since it uses less digits than its factorization.

21826822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10913413.

The product of its digits is 6144, while the sum is 31.

The square root of 21826822 is about 4671.9184496307. The cubic root of 21826822 is about 279.4667657613.

The spelling of 21826822 in words is "twenty-one million, eight hundred twenty-six thousand, eight hundred twenty-two".