221143530 has 16 divisors (see below), whose sum is σ = 530744544. Its totient is φ = 58971600.

The previous prime is 221143529. The next prime is 221143541. The reversal of 221143530 is 35341122.

It is a junction number, because it is equal to n+sod(n) for n = 221143497 and 221143506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3685696 + ... + 3685755.

It is an arithmetic number, because the mean of its divisors is an integer number (33171534).

Almost surely, 2^221143530 is an apocalyptic number.

221143530 is an abundant number, since it is smaller than the sum of its proper divisors (309601014).

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

221143530 is a wasteful number, since it uses less digits than its factorization.

221143530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7371461.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221143530 is about 14870.8954000759. The cubic root of 221143530 is about 604.7252172923.

Adding to 221143530 its reverse (35341122), we get a palindrome (256484652).

The spelling of 221143530 in words is "two hundred twenty-one million, one hundred forty-three thousand, five hundred thirty".