221321030 has 32 divisors (see below), whose sum is σ = 455811840. Its totient is φ = 75794400.

The previous prime is 221321027. The next prime is 221321053. The reversal of 221321030 is 30123122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 221320996 and 221321014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100481 + ... + 102659.

It is an arithmetic number, because the mean of its divisors is an integer number (14244120).

Almost surely, 2^221321030 is an apocalyptic number.

221321030 is an abundant number, since it is smaller than the sum of its proper divisors (234490810).

221321030 is a wasteful number, since it uses less digits than its factorization.

221321030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3644.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221321030 is about 14876.8622363723. The cubic root of 221321030 is about 604.8869674771.

Adding to 221321030 its reverse (30123122), we get a palindrome (251444152).

The spelling of 221321030 in words is "two hundred twenty-one million, three hundred twenty-one thousand, thirty".