21722554 has 16 divisors (see below), whose sum is σ = 38032128. Its totient is φ = 9111312.

The previous prime is 21722543. The next prime is 21722587. The reversal of 21722554 is 45522712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15849 + ... + 17164.

It is an arithmetic number, because the mean of its divisors is an integer number (2377008).

Almost surely, 2^21722554 is an apocalyptic number.

21722554 is a deficient number, since it is larger than the sum of its proper divisors (16309574).

21722554 is a wasteful number, since it uses less digits than its factorization.

21722554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33069.

The product of its digits is 5600, while the sum is 28.

The square root of 21722554 is about 4660.7460776146. The cubic root of 21722554 is about 279.0210455898.

The spelling of 21722554 in words is "twenty-one million, seven hundred twenty-two thousand, five hundred fifty-four".