1221100102222 has 96 divisors (see below), whose sum is σ = 2502447740352. Its totient is φ = 434808000000.

The previous prime is 1221100102213. The next prime is 1221100102223. The reversal of 1221100102222 is 2222010011221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221100102196 and 1221100102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100102223) 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, 1949722 + ... + 2498722.

It is an arithmetic number, because the mean of its divisors is an integer number (26067163962).

Almost surely, 2^{1221100102222} is an apocalyptic number.

1221100102222 is an abundant number, since it is smaller than the sum of its proper divisors (1281347638130).

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

1221100102222 is a wasteful number, since it uses less digits than its factorization.

1221100102222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549146 (or 549135 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221100102222 its reverse (2222010011221), we get a palindrome (3443110113443).

The spelling of 1221100102222 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred two thousand, two hundred twenty-two".