1222221001212 has 18 divisors (see below), whose sum is σ = 3089503086488. Its totient is φ = 407407000392.

The previous prime is 1222221001181. The next prime is 1222221001219. The reversal of 1222221001212 is 2121001222221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×1222221001212³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222221001219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16975291648 + ... + 16975291719.

Almost surely, 2^{1222221001212} is an apocalyptic number.

1222221001212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1222221001212 is an abundant number, since it is smaller than the sum of its proper divisors (1867282085276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222221001212 is a wasteful number, since it uses less digits than its factorization.

1222221001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33950583377 (or 33950583372 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1222221001212 its reverse (2121001222221), we get a palindrome (3343222223433).

The spelling of 1222221001212 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-one million, one thousand, two hundred twelve".