221221300430 has 32 divisors (see below), whose sum is σ = 447473726784. Its totient is φ = 78130331136.

The previous prime is 221221300397. The next prime is 221221300451. The reversal of 221221300430 is 34003122122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36990539 + ... + 36996518.

It is an arithmetic number, because the mean of its divisors is an integer number (13983553962).

Almost surely, 2^221221300430 is an apocalyptic number.

221221300430 is an abundant number, since it is smaller than the sum of its proper divisors (226252426354).

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

221221300430 is a wasteful number, since it uses less digits than its factorization.

221221300430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73987100.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 221221300430 its reverse (34003122122), we get a palindrome (255224422552).

The spelling of 221221300430 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred thousand, four hundred thirty".