221243130 has 32 divisors (see below), whose sum is σ = 589982400. Its totient is φ = 58998096.

The previous prime is 221243107. The next prime is 221243137. The reversal of 221243130 is 31342122.

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 (221243137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409440 + ... + 409979.

It is an arithmetic number, because the mean of its divisors is an integer number (18436950).

Almost surely, 2^221243130 is an apocalyptic number.

221243130 is an abundant number, since it is smaller than the sum of its proper divisors (368739270).

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

221243130 is a wasteful number, since it uses less digits than its factorization.

221243130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819435 (or 819429 counting only the distinct ones).

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

The square root of 221243130 is about 14874.2438463271. The cubic root of 221243130 is about 604.8159903022.

Adding to 221243130 its reverse (31342122), we get a palindrome (252585252).

The spelling of 221243130 in words is "two hundred twenty-one million, two hundred forty-three thousand, one hundred thirty".