221021030 has 16 divisors (see below), whose sum is σ = 415135584. Its totient is φ = 84564480.

The previous prime is 221020957. The next prime is 221021033. The reversal of 221021030 is 30120122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021033) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 480251 + ... + 480710.

It is an arithmetic number, because the mean of its divisors is an integer number (25945974).

Almost surely, 2^221021030 is an apocalyptic number.

221021030 is a deficient number, since it is larger than the sum of its proper divisors (194114554).

221021030 is a wasteful number, since it uses less digits than its factorization.

221021030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960991.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 221021030 is about 14866.7760459354. The cubic root of 221021030 is about 604.6135363978.

Adding to 221021030 its reverse (30120122), we get a palindrome (251141152).

It can be divided in two parts, 22102 and 1030, that added together give a palindrome (23132).

The spelling of 221021030 in words is "two hundred twenty-one million, twenty-one thousand, thirty".