221213031232 has 28 divisors (see below), whose sum is σ = 443315855556. Its totient is φ = 109511398400.

The previous prime is 221213031227. The next prime is 221213031289. The reversal of 221213031232 is 232130312122.

It can be written as a sum of positive squares in 2 ways, for example, as 118187438656 + 103025592576 = 343784^2 + 320976^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17104693 + ... + 17117620.

It is an arithmetic number, because the mean of its divisors is an integer number (15832709127).

Almost surely, 2^221213031232 is an apocalyptic number.

It is an amenable number.

221213031232 is an abundant number, since it is smaller than the sum of its proper divisors (222102824324).

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

221213031232 is a wasteful number, since it uses less digits than its factorization.

221213031232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34222426 (or 34222416 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221213031232 its reverse (232130312122), we get a palindrome (453343343354).

The spelling of 221213031232 in words is "two hundred twenty-one billion, two hundred thirteen million, thirty-one thousand, two hundred thirty-two".