221020313212 has 12 divisors (see below), whose sum is σ = 395780561176. Its totient is φ = 107940152880.

The previous prime is 221020313209. The next prime is 221020313221. The reversal of 221020313212 is 212313020122.

It is a self number, because there is not a number n which added to its sum of digits gives 221020313212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642500739 + ... + 642501082.

Almost surely, 2^221020313212 is an apocalyptic number.

It is an amenable number.

221020313212 is a deficient number, since it is larger than the sum of its proper divisors (174760247964).

221020313212 is a wasteful number, since it uses less digits than its factorization.

221020313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285001868 (or 1285001866 counting only the distinct ones).

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

Adding to 221020313212 its reverse (212313020122), we get a palindrome (433333333334).

The spelling of 221020313212 in words is "two hundred twenty-one billion, twenty million, three hundred thirteen thousand, two hundred twelve".