21730922 has 8 divisors (see below), whose sum is σ = 32671296. Its totient is φ = 10840492.

The previous prime is 21730903. The next prime is 21730957. The reversal of 21730922 is 22903712.

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 = 21730891 and 21730900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11378 + ... + 13149.

It is an arithmetic number, because the mean of its divisors is an integer number (4083912).

Almost surely, 2^21730922 is an apocalyptic number.

21730922 is a deficient number, since it is larger than the sum of its proper divisors (10940374).

21730922 is a wasteful number, since it uses less digits than its factorization.

21730922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24972.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21730922 is about 4661.6437015285. The cubic root of 21730922 is about 279.0568693142.

The spelling of 21730922 in words is "twenty-one million, seven hundred thirty thousand, nine hundred twenty-two".