21466630 has 8 divisors (see below), whose sum is σ = 38639952. Its totient is φ = 8586648.

The previous prime is 21466609. The next prime is 21466633. The reversal of 21466630 is 3666412.

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 (21466633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073322 + ... + 1073341.

It is an arithmetic number, because the mean of its divisors is an integer number (4829994).

Almost surely, 2^21466630 is an apocalyptic number.

21466630 is a deficient number, since it is larger than the sum of its proper divisors (17173322).

21466630 is a wasteful number, since it uses less digits than its factorization.

21466630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146670.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 21466630 is about 4633.2094707665. The cubic root of 21466630 is about 277.9209529756.

The spelling of 21466630 in words is "twenty-one million, four hundred sixty-six thousand, six hundred thirty".