1221222201212 has 48 divisors (see below), whose sum is σ = 2401787277120. Its totient is φ = 539093035008.

The previous prime is 1221222201191. The next prime is 1221222201217. The reversal of 1221222201212 is 2121022221221.

It is a super-2 number, since 2×1221222201212² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222201217) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 19330508 + ... + 19393580.

It is an arithmetic number, because the mean of its divisors is an integer number (50037234940).

Almost surely, 2^{1221222201212} is an apocalyptic number.

It is an amenable number.

1221222201212 is a deficient number, since it is larger than the sum of its proper divisors (1180565075908).

1221222201212 is a wasteful number, since it uses less digits than its factorization.

1221222201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79302 (or 79300 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1221222201212 its reverse (2121022221221), we get a palindrome (3342244422433).

The spelling of 1221222201212 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, two hundred twelve".