21174320 has 40 divisors (see below), whose sum is σ = 50048880. Its totient is φ = 8328960.

The previous prime is 21174319. The next prime is 21174331. The reversal of 21174320 is 2347112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21174292 and 21174301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2711 + ... + 7049.

It is an arithmetic number, because the mean of its divisors is an integer number (1251222).

Almost surely, 2^21174320 is an apocalyptic number.

21174320 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 21174320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25024440).

21174320 is an abundant number, since it is smaller than the sum of its proper divisors (28874560).

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

21174320 is a wasteful number, since it uses less digits than its factorization.

21174320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4413 (or 4407 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21174320 is about 4601.5562584847. The cubic root of 21174320 is about 276.6537049782.

The spelling of 21174320 in words is "twenty-one million, one hundred seventy-four thousand, three hundred twenty".