21860168 has 64 divisors (see below), whose sum is σ = 47044800. Its totient is φ = 9434880.

The previous prime is 21860117. The next prime is 21860183. The reversal of 21860168 is 86106812.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200498 + ... + 200606.

It is an arithmetic number, because the mean of its divisors is an integer number (735075).

Almost surely, 2^21860168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21860168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23522400).

21860168 is an abundant number, since it is smaller than the sum of its proper divisors (25184632).

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

21860168 is a wasteful number, since it uses less digits than its factorization.

21860168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 21860168 is about 4675.4858571062. The cubic root of 21860168 is about 279.6090121075.

The spelling of 21860168 in words is "twenty-one million, eight hundred sixty thousand, one hundred sixty-eight".