21660614 has 8 divisors (see below), whose sum is σ = 33369168. Its totient is φ = 10537560.

The previous prime is 21660607. The next prime is 21660619. The reversal of 21660614 is 41606612.

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 (21660619) 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, 146282 + ... + 146429.

It is an arithmetic number, because the mean of its divisors is an integer number (4171146).

Almost surely, 2^21660614 is an apocalyptic number.

21660614 is a deficient number, since it is larger than the sum of its proper divisors (11708554).

21660614 is a wasteful number, since it uses less digits than its factorization.

21660614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292750.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21660614 is about 4654.0964751496. The cubic root of 21660614 is about 278.7555915949.

The spelling of 21660614 in words is "twenty-one million, six hundred sixty thousand, six hundred fourteen".