221420111252 has 12 divisors (see below), whose sum is σ = 387627201780. Its totient is φ = 110669482176.

The previous prime is 221420111249. The next prime is 221420111329. The reversal of 221420111252 is 252111024122.

221420111252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 118939455376 + 102480655876 = 344876^2 + 320126^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10131083 + ... + 10152914.

It is an arithmetic number, because the mean of its divisors is an integer number (32302266815).

Almost surely, 2^221420111252 is an apocalyptic number.

It is an amenable number.

221420111252 is a deficient number, since it is larger than the sum of its proper divisors (166207090528).

221420111252 is a wasteful number, since it uses less digits than its factorization.

221420111252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20286730 (or 20286728 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 221420111252 its reverse (252111024122), we get a palindrome (473531135374).

The spelling of 221420111252 in words is "two hundred twenty-one billion, four hundred twenty million, one hundred eleven thousand, two hundred fifty-two".