21424630 has 8 divisors (see below), whose sum is σ = 38564352. Its totient is φ = 8569848.

The previous prime is 21424619. The next prime is 21424631. The reversal of 21424630 is 3642412.

It is a happy number.

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 (21424631) 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, 1071222 + ... + 1071241.

It is an arithmetic number, because the mean of its divisors is an integer number (4820544).

Almost surely, 2^21424630 is an apocalyptic number.

21424630 is a deficient number, since it is larger than the sum of its proper divisors (17139722).

21424630 is a wasteful number, since it uses less digits than its factorization.

21424630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142470.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21424630 is about 4628.6747563423. The cubic root of 21424630 is about 277.7395815332.

The spelling of 21424630 in words is "twenty-one million, four hundred twenty-four thousand, six hundred thirty".