1211221002222 has 96 divisors (see below), whose sum is σ = 3280984911360. Its totient is φ = 313726397760.

The previous prime is 1211221002133. The next prime is 1211221002227. The reversal of 1211221002222 is 2222001221121.

It is a happy number.

It is a super-4 number, since 4×1211221002222⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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

It is a junction number, because it is equal to n+sod(n) for n = 1211221002195 and 1211221002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221002227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 719553 + ... + 1714700.

It is an arithmetic number, because the mean of its divisors is an integer number (34176926160).

Almost surely, 2^{1211221002222} is an apocalyptic number.

1211221002222 is an abundant number, since it is smaller than the sum of its proper divisors (2069763909138).

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

1211221002222 is a wasteful number, since it uses less digits than its factorization.

1211221002222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434638 (or 2434635 counting only the distinct ones).

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

Adding to 1211221002222 its reverse (2222001221121), we get a palindrome (3433222223343).

The spelling of 1211221002222 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, two thousand, two hundred twenty-two".