21330162 has 64 divisors (see below), whose sum is σ = 54984960. Its totient is φ = 6003072.

The previous prime is 21330161. The next prime is 21330163. The reversal of 21330162 is 26103312.

It is an interprime number because it is at equal distance from previous prime (21330161) and next prime (21330163).

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

It is not an unprimeable number, because it can be changed into a prime (21330161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27208 + ... + 27980.

It is an arithmetic number, because the mean of its divisors is an integer number (859140).

Almost surely, 2^21330162 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21330162, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27492480).

21330162 is an abundant number, since it is smaller than the sum of its proper divisors (33654798).

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

21330162 is a wasteful number, since it uses less digits than its factorization.

21330162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21330162 is about 4618.4588338536. The cubic root of 21330162 is about 277.3307660609.

Adding to 21330162 its reverse (26103312), we get a palindrome (47433474).

The spelling of 21330162 in words is "twenty-one million, three hundred thirty thousand, one hundred sixty-two".