221332131212 has 6 divisors (see below), whose sum is σ = 387331229628. Its totient is φ = 110666065604.

The previous prime is 221332131211. The next prime is 221332131221. The reversal of 221332131212 is 212131233122.

It is not an unprimeable number, because it can be changed into a prime (221332131211) 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 as a sum of consecutive naturals, namely, 27666516398 + ... + 27666516405.

It is an arithmetic number, because the mean of its divisors is an integer number (64555204938).

Almost surely, 2^221332131212 is an apocalyptic number.

It is an amenable number.

221332131212 is a deficient number, since it is larger than the sum of its proper divisors (165999098416).

221332131212 is a wasteful number, since it uses less digits than its factorization.

221332131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55333032807 (or 55333032805 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

Adding to 221332131212 its reverse (212131233122), we get a palindrome (433463364334).

The spelling of 221332131212 in words is "two hundred twenty-one billion, three hundred thirty-two million, one hundred thirty-one thousand, two hundred twelve".