221220111021212 has 48 divisors (see below), whose sum is σ = 400061429792640. Its totient is φ = 106968288268800.

The previous prime is 221220111021187. The next prime is 221220111021263. The reversal of 221220111021212 is 212120111022122.

It is a super-3 number, since 3×221220111021212³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3877787 + ... + 21388722.

It is an arithmetic number, because the mean of its divisors is an integer number (8334613120680).

Almost surely, 2^{221220111021212} is an apocalyptic number.

It is an amenable number.

221220111021212 is a deficient number, since it is larger than the sum of its proper divisors (178841318771428).

221220111021212 is a wasteful number, since it uses less digits than its factorization.

221220111021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25267022 (or 25267020 counting only the distinct ones).

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

Adding to 221220111021212 its reverse (212120111022122), we get a palindrome (433340222043334).

The spelling of 221220111021212 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, twenty-one thousand, two hundred twelve".