21755422 has 8 divisors (see below), whose sum is σ = 35143416. Its totient is φ = 10040952.

The previous prime is 21755413. The next prime is 21755429. The reversal of 21755422 is 22455712.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21755429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418348 + ... + 418399.

It is an arithmetic number, because the mean of its divisors is an integer number (4392927).

Almost surely, 2^21755422 is an apocalyptic number.

21755422 is a deficient number, since it is larger than the sum of its proper divisors (13387994).

21755422 is a wasteful number, since it uses less digits than its factorization.

21755422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836762.

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

The square root of 21755422 is about 4664.2707897377. The cubic root of 21755422 is about 279.1617018894.

The spelling of 21755422 in words is "twenty-one million, seven hundred fifty-five thousand, four hundred twenty-two".