21009674 has 8 divisors (see below), whose sum is σ = 36016608. Its totient is φ = 9004140.

The previous prime is 21009643. The next prime is 21009679. The reversal of 21009674 is 47690012.

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

It is not an unprimeable number, because it can be changed into a prime (21009679) 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, 750332 + ... + 750359.

It is an arithmetic number, because the mean of its divisors is an integer number (4502076).

Almost surely, 2^21009674 is an apocalyptic number.

21009674 is a deficient number, since it is larger than the sum of its proper divisors (15006934).

21009674 is a wasteful number, since it uses less digits than its factorization.

21009674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500700.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21009674 is about 4583.6310933582. The cubic root of 21009674 is about 275.9347759479.

Adding to 21009674 its reverse (47690012), we get a palindrome (68699686).

The spelling of 21009674 in words is "twenty-one million, nine thousand, six hundred seventy-four".