21174120 has 96 divisors (see below), whose sum is σ = 75085920. Its totient is φ = 5132160.

The previous prime is 21174059. The next prime is 21174121. The reversal of 21174120 is 2147112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21174093 and 21174102.

It is not an unprimeable number, because it can be changed into a prime (21174121) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1287 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (782145).

Almost surely, 2^21174120 is an apocalyptic number.

21174120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21174120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37542960).

21174120 is an abundant number, since it is smaller than the sum of its proper divisors (53911800).

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

21174120 is a wasteful number, since it uses less digits than its factorization.

21174120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5375 (or 5368 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21174120 is about 4601.5345266552. The cubic root of 21174120 is about 276.6528339401.

The spelling of 21174120 in words is "twenty-one million, one hundred seventy-four thousand, one hundred twenty".