21158160 has 80 divisors (see below), whose sum is σ = 68459904. Its totient is φ = 5395456.

The previous prime is 21158147. The next prime is 21158161. The reversal of 21158160 is 6185112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21158160.

It is not an unprimeable number, because it can be changed into a prime (21158161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3604 + ... + 7436.

Almost surely, 2^21158160 is an apocalyptic number.

21158160 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 21158160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34229952).

21158160 is an abundant number, since it is smaller than the sum of its proper divisors (47301744).

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

21158160 is a wasteful number, since it uses less digits than its factorization.

21158160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3872 (or 3866 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 21158160 is about 4599.7999956520. The cubic root of 21158160 is about 276.5833074134.

The spelling of 21158160 in words is "twenty-one million, one hundred fifty-eight thousand, one hundred sixty".