1221102221202 has 96 divisors (see below), whose sum is σ = 2827132139520. Its totient is φ = 379813017600.

The previous prime is 1221102221197. The next prime is 1221102221243. The reversal of 1221102221202 is 2021222011221.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6575023 + ... + 6758189.

It is an arithmetic number, because the mean of its divisors is an integer number (29449293120).

Almost surely, 2^{1221102221202} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221102221202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1413566069760).

1221102221202 is an abundant number, since it is smaller than the sum of its proper divisors (1606029918318).

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

1221102221202 is a wasteful number, since it uses less digits than its factorization.

1221102221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183488 (or 183485 counting only the distinct ones).

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

Adding to 1221102221202 its reverse (2021222011221), we get a palindrome (3242324232423).

The spelling of 1221102221202 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty-one thousand, two hundred two".