21045174 has 8 divisors (see below), whose sum is σ = 42090360. Its totient is φ = 7015056.

The previous prime is 21045151. The next prime is 21045197. The reversal of 21045174 is 47154012.

It is an interprime number because it is at equal distance from previous prime (21045151) and next prime (21045197).

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

21045174 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1753759 + ... + 1753770.

It is an arithmetic number, because the mean of its divisors is an integer number (5261295).

Almost surely, 2^21045174 is an apocalyptic number.

21045174 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21045174 is a wasteful number, since it uses less digits than its factorization.

21045174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507534.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 21045174 is about 4587.5019346045. The cubic root of 21045174 is about 276.0901039565.

Adding to 21045174 its reverse (47154012), we get a palindrome (68199186).

The spelling of 21045174 in words is "twenty-one million, forty-five thousand, one hundred seventy-four".