221011221021212 has 12 divisors (see below), whose sum is σ = 386799427345296. Its totient is φ = 110497098922560.

The previous prime is 221011221021197. The next prime is 221011221021233. The reversal of 221011221021212 is 212120122110122.

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, 2127838589 + ... + 2127942452.

It is an arithmetic number, because the mean of its divisors is an integer number (32233285612108).

Almost surely, 2^{221011221021212} is an apocalyptic number.

It is an amenable number.

221011221021212 is a deficient number, since it is larger than the sum of its proper divisors (165788206324084).

221011221021212 is a wasteful number, since it uses less digits than its factorization.

221011221021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255794028 (or 4255794026 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221011221021212 its reverse (212120122110122), we get a palindrome (433131343131334).

The spelling of 221011221021212 in words is "two hundred twenty-one trillion, eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred twelve".