221330211220 has 12 divisors (see below), whose sum is σ = 464793443604. Its totient is φ = 88532084480.

The previous prime is 221330211209. The next prime is 221330211269. The reversal of 221330211220 is 22112033122.

It can be written as a sum of positive squares in 2 ways, for example, as 22544421904 + 198785789316 = 150148^2 + 445854^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5533255261 + ... + 5533255300.

It is an arithmetic number, because the mean of its divisors is an integer number (38732786967).

Almost surely, 2^221330211220 is an apocalyptic number.

221330211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221330211220 is an abundant number, since it is smaller than the sum of its proper divisors (243463232384).

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

221330211220 is a wasteful number, since it uses less digits than its factorization.

221330211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066510570 (or 11066510568 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221330211220 its reverse (22112033122), we get a palindrome (243442244342).

The spelling of 221330211220 in words is "two hundred twenty-one billion, three hundred thirty million, two hundred eleven thousand, two hundred twenty".