1221100002222 has 16 divisors (see below), whose sum is σ = 2453774414592. Its totient is φ = 405104265720.

The previous prime is 1221100002209. The next prime is 1221100002229. The reversal of 1221100002222 is 2222000011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100002229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482265718 + ... + 482268249.

It is an arithmetic number, because the mean of its divisors is an integer number (153360900912).

Almost surely, 2^{1221100002222} is an apocalyptic number.

1221100002222 is an abundant number, since it is smaller than the sum of its proper divisors (1232674412370).

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

1221100002222 is a wasteful number, since it uses less digits than its factorization.

1221100002222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964534183.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1221100002222 its reverse (2222000011221), we get a palindrome (3443100013443).

The spelling of 1221100002222 in words is "one trillion, two hundred twenty-one billion, one hundred million, two thousand, two hundred twenty-two".