21995622 has 36 divisors (see below), whose sum is σ = 52388700. Its totient is φ = 6664680.

The previous prime is 21995621. The next prime is 21995681. The reversal of 21995622 is 22659912.

It is a happy number.

21995622 is a `hidden beast` number, since 2 + 1 + 99 + 562 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21995621) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2872 + ... + 7227.

Almost surely, 2^21995622 is an apocalyptic number.

21995622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21995622 is an abundant number, since it is smaller than the sum of its proper divisors (30393078).

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

21995622 is a wasteful number, since it uses less digits than its factorization.

21995622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129 (or 10115 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 21995622 is about 4689.9490402349. The cubic root of 21995622 is about 280.1853449716.

The spelling of 21995622 in words is "twenty-one million, nine hundred ninety-five thousand, six hundred twenty-two".