21952330 has 8 divisors (see below), whose sum is σ = 39514212. Its totient is φ = 8780928.

The previous prime is 21952313. The next prime is 21952339. The reversal of 21952330 is 3325912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21538881 + 413449 = 4641^2 + 643^2 .

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 = 21952295 and 21952304.

It is not an unprimeable number, because it can be changed into a prime (21952339) 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, 1097607 + ... + 1097626.

Almost surely, 2^21952330 is an apocalyptic number.

21952330 is a deficient number, since it is larger than the sum of its proper divisors (17561882).

21952330 is a wasteful number, since it uses less digits than its factorization.

21952330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195240.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 21952330 is about 4685.3313650157. The cubic root of 21952330 is about 280.0014030542.

The spelling of 21952330 in words is "twenty-one million, nine hundred fifty-two thousand, three hundred thirty".