221300442 has 24 divisors (see below), whose sum is σ = 523074240. Its totient is φ = 67060680.

The previous prime is 221300381. The next prime is 221300461. The reversal of 221300442 is 244003122.

221300442 is a `hidden beast` number, since 221 + 3 + 0 + 0 + 442 = 666.

221300442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11 ways as a sum of consecutive naturals, for example, 558642 + ... + 559037.

It is an arithmetic number, because the mean of its divisors is an integer number (21794760).

Almost surely, 2^221300442 is an apocalyptic number.

221300442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221300442 is an abundant number, since it is smaller than the sum of its proper divisors (301773798).

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

221300442 is a wasteful number, since it uses less digits than its factorization.

221300442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117698 (or 1117695 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 221300442 is about 14876.1702732928. The cubic root of 221300442 is about 604.8682107129.

Adding to 221300442 its reverse (244003122), we get a palindrome (465303564).

The spelling of 221300442 in words is "two hundred twenty-one million, three hundred thousand, four hundred forty-two".