221982930 has 96 divisors (see below), whose sum is σ = 644664384. Its totient is φ = 54634176.

The previous prime is 221982883. The next prime is 221982967. The reversal of 221982930 is 39289122.

221982930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221982930² = 98552842422769800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28077 + ... + 35103.

It is an arithmetic number, because the mean of its divisors is an integer number (6715254).

Almost surely, 2^221982930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221982930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322332192).

221982930 is an abundant number, since it is smaller than the sum of its proper divisors (422681454).

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

221982930 is a wasteful number, since it uses less digits than its factorization.

221982930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062 (or 7050 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 221982930 is about 14899.0915830463. The cubic root of 221982930 is about 605.4893747810.

The spelling of 221982930 in words is "two hundred twenty-one million, nine hundred eighty-two thousand, nine hundred thirty".