21965630 has 8 divisors (see below), whose sum is σ = 39538152. Its totient is φ = 8786248.

The previous prime is 21965623. The next prime is 21965651. The reversal of 21965630 is 3656912.

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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1098272 + ... + 1098291.

It is an arithmetic number, because the mean of its divisors is an integer number (4942269).

Almost surely, 2^21965630 is an apocalyptic number.

21965630 is a deficient number, since it is larger than the sum of its proper divisors (17572522).

21965630 is a wasteful number, since it uses less digits than its factorization.

21965630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196570.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 21965630 is about 4686.7504734091. The cubic root of 21965630 is about 280.0579386905.

The spelling of 21965630 in words is "twenty-one million, nine hundred sixty-five thousand, six hundred thirty".