21802160 has 120 divisors (see below), whose sum is σ = 57558816. Its totient is φ = 7659520.

The previous prime is 21802159. The next prime is 21802189. The reversal of 21802160 is 6120812.

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

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 23 ways as a sum of consecutive naturals, for example, 531740 + ... + 531780.

Almost surely, 2^21802160 is an apocalyptic number.

21802160 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 21802160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28779408).

21802160 is an abundant number, since it is smaller than the sum of its proper divisors (35756656).

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

21802160 is a wasteful number, since it uses less digits than its factorization.

21802160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21802160 is about 4669.2783168280. The cubic root of 21802160 is about 279.3614701327.

Adding to 21802160 its reverse (6120812), we get a palindrome (27922972).

The spelling of 21802160 in words is "twenty-one million, eight hundred two thousand, one hundred sixty".