21221232230 has 128 divisors (see below), whose sum is σ = 43528181760. Its totient is φ = 7382016000.

The previous prime is 21221232223. The next prime is 21221232239. The reversal of 21221232230 is 3223212212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221232239) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 78306995 + ... + 78307265.

It is an arithmetic number, because the mean of its divisors is an integer number (340063920).

Almost surely, 2^21221232230 is an apocalyptic number.

21221232230 is an abundant number, since it is smaller than the sum of its proper divisors (22306949530).

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

21221232230 is a wasteful number, since it uses less digits than its factorization.

21221232230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606.

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

Adding to 21221232230 its reverse (3223212212), we get a palindrome (24444444442).

It can be divided in two parts, 212212 and 32230, that added together give a palindrome (244442).

The spelling of 21221232230 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, two hundred thirty".