221620230 has 96 divisors (see below), whose sum is σ = 623566944. Its totient is φ = 54286848.

The previous prime is 221620229. The next prime is 221620241. The reversal of 221620230 is 32026122.

221620230 is a `hidden beast` number, since 2 + 21 + 620 + 23 + 0 = 666.

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

It is a congruent number.

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, 358882 + ... + 359498.

It is an arithmetic number, because the mean of its divisors is an integer number (6495489).

Almost surely, 2^221620230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221620230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311783472).

221620230 is an abundant number, since it is smaller than the sum of its proper divisors (401946714).

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

221620230 is a wasteful number, since it uses less digits than its factorization.

221620230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950 (or 947 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221620230 is about 14886.9147240118. The cubic root of 221620230 is about 605.1594234148.

Adding to 221620230 its reverse (32026122), we get a palindrome (253646352).

The spelling of 221620230 in words is "two hundred twenty-one million, six hundred twenty thousand, two hundred thirty".