1221100221102 has 32 divisors (see below), whose sum is σ = 2502269280000. Its totient is φ = 397025926080.

The previous prime is 1221100221043. The next prime is 1221100221119. The reversal of 1221100221102 is 2011220011221.

It is a congruent number.

It is an unprimeable number.

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, 733273 + ... + 1726235.

It is an arithmetic number, because the mean of its divisors is an integer number (78195915000).

Almost surely, 2^{1221100221102} is an apocalyptic number.

1221100221102 is an abundant number, since it is smaller than the sum of its proper divisors (1281169058898).

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

1221100221102 is a wasteful number, since it uses less digits than its factorization.

1221100221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998008.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221100221102 its reverse (2011220011221), we get a palindrome (3232320232323).

The spelling of 1221100221102 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred twenty-one thousand, one hundred two".