21873622 has 16 divisors (see below), whose sum is σ = 33269040. Its totient is φ = 10785312.

The previous prime is 21873613. The next prime is 21873629. The reversal of 21873622 is 22637812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21873629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74508 + ... + 74800.

It is an arithmetic number, because the mean of its divisors is an integer number (2079315).

Almost surely, 2^21873622 is an apocalyptic number.

21873622 is a deficient number, since it is larger than the sum of its proper divisors (11395418).

21873622 is a wasteful number, since it uses less digits than its factorization.

21873622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687.

The product of its digits is 8064, while the sum is 31.

The square root of 21873622 is about 4676.9244167508. The cubic root of 21873622 is about 279.6663628128. Note that the first 3 decimals are identical.

The spelling of 21873622 in words is "twenty-one million, eight hundred seventy-three thousand, six hundred twenty-two".