21634822 has 16 divisors (see below), whose sum is σ = 35521344. Its totient is φ = 9801000.

The previous prime is 21634813. The next prime is 21634849. The reversal of 21634822 is 22843612.

It is a congruent number.

It is an unprimeable number.

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, 5797 + ... + 8767.

It is an arithmetic number, because the mean of its divisors is an integer number (2220084).

Almost surely, 2^21634822 is an apocalyptic number.

21634822 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21634822 is a deficient number, since it is larger than the sum of its proper divisors (13886522).

21634822 is a wasteful number, since it uses less digits than its factorization.

21634822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315.

The product of its digits is 4608, while the sum is 28.

The square root of 21634822 is about 4651.3247575288. The cubic root of 21634822 is about 278.6449065244.

The spelling of 21634822 in words is "twenty-one million, six hundred thirty-four thousand, eight hundred twenty-two".