21171674 has 8 divisors (see below), whose sum is σ = 31803840. Its totient is φ = 10570396.

The previous prime is 21171673. The next prime is 21171701. The reversal of 21171674 is 47617112.

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 (21171671) 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, 5924 + ... + 8799.

It is an arithmetic number, because the mean of its divisors is an integer number (3975480).

Almost surely, 2^21171674 is an apocalyptic number.

21171674 is a deficient number, since it is larger than the sum of its proper divisors (10632166).

21171674 is a wasteful number, since it uses less digits than its factorization.

21171674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15444.

The product of its digits is 2352, while the sum is 29.

The square root of 21171674 is about 4601.2687380765. The cubic root of 21171674 is about 276.6421807010.

Adding to 21171674 its reverse (47617112), we get a palindrome (68788786).

The spelling of 21171674 in words is "twenty-one million, one hundred seventy-one thousand, six hundred seventy-four".