21904622 has 8 divisors (see below), whose sum is σ = 32878656. Its totient is φ = 10945072.

The previous prime is 21904609. The next prime is 21904643. The reversal of 21904622 is 22640912.

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

It is a junction number, because it is equal to n+sod(n) for n = 21904591 and 21904600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763 + ... + 6849.

It is an arithmetic number, because the mean of its divisors is an integer number (4109832).

Almost surely, 2^21904622 is an apocalyptic number.

21904622 is a deficient number, since it is larger than the sum of its proper divisors (10974034).

21904622 is a wasteful number, since it uses less digits than its factorization.

21904622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7242.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21904622 is about 4680.2373871418. The cubic root of 21904622 is about 279.7984178337.

The spelling of 21904622 in words is "twenty-one million, nine hundred four thousand, six hundred twenty-two".