21241170 has 64 divisors (see below), whose sum is σ = 57127680. Its totient is φ = 5616000.

The previous prime is 21241163. The next prime is 21241217. The reversal of 21241170 is 7114212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40510 + ... + 41030.

It is an arithmetic number, because the mean of its divisors is an integer number (892620).

Almost surely, 2^21241170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21241170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28563840).

21241170 is an abundant number, since it is smaller than the sum of its proper divisors (35886510).

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

21241170 is a wasteful number, since it uses less digits than its factorization.

21241170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 682 counting only the distinct ones).

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

The square root of 21241170 is about 4608.8143811614. The cubic root of 21241170 is about 276.9445426736.

Adding to 21241170 its reverse (7114212), we get a palindrome (28355382).

The spelling of 21241170 in words is "twenty-one million, two hundred forty-one thousand, one hundred seventy".