21516674 has 8 divisors (see below), whose sum is σ = 32300688. Its totient is φ = 10749780.

The previous prime is 21516667. The next prime is 21516689. The reversal of 21516674 is 47661512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21516674.

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, 452 + ... + 6575.

It is an arithmetic number, because the mean of its divisors is an integer number (4037586).

Almost surely, 2^21516674 is an apocalyptic number.

21516674 is a deficient number, since it is larger than the sum of its proper divisors (10784014).

21516674 is a wasteful number, since it uses less digits than its factorization.

21516674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8560.

The product of its digits is 10080, while the sum is 32.

The square root of 21516674 is about 4638.6069029397. The cubic root of 21516674 is about 278.1367527584.

The spelling of 21516674 in words is "twenty-one million, five hundred sixteen thousand, six hundred seventy-four".