21324174 has 16 divisors (see below), whose sum is σ = 44502912. Its totient is φ = 6798968.

The previous prime is 21324161. The next prime is 21324181. The reversal of 21324174 is 47142312.

It is a happy number.

It is a super-6 number, since 6×21324174⁶ (a number of 45 digits) contains 666666 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 77124 + ... + 77399.

It is an arithmetic number, because the mean of its divisors is an integer number (2781432).

Almost surely, 2^21324174 is an apocalyptic number.

21324174 is an abundant number, since it is smaller than the sum of its proper divisors (23178738).

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

21324174 is a wasteful number, since it uses less digits than its factorization.

21324174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154551.

The product of its digits is 1344, while the sum is 24.

The square root of 21324174 is about 4617.8105201491. The cubic root of 21324174 is about 277.3048120144.

Adding to 21324174 its reverse (47142312), we get a palindrome (68466486).

The spelling of 21324174 in words is "twenty-one million, three hundred twenty-four thousand, one hundred seventy-four".