21722622 has 8 divisors (see below), whose sum is σ = 43445256. Its totient is φ = 7240872.

The previous prime is 21722609. The next prime is 21722627. The reversal of 21722622 is 22622712.

It is a sphenic number, since it is the product of 3 distinct primes.

21722622 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21722592 and 21722601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1810213 + ... + 1810224.

It is an arithmetic number, because the mean of its divisors is an integer number (5430657).

Almost surely, 2^21722622 is an apocalyptic number.

21722622 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21722622 is a wasteful number, since it uses less digits than its factorization.

21722622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3620442.

The product of its digits is 1344, while the sum is 24.

The square root of 21722622 is about 4660.7533725783. The cubic root of 21722622 is about 279.0213367375.

The spelling of 21722622 in words is "twenty-one million, seven hundred twenty-two thousand, six hundred twenty-two".