1221222101022 has 192 divisors, whose sum is σ = 3469258211328. Its totient is φ = 312732252000.

The previous prime is 1221222101017. The next prime is 1221222101041. The reversal of 1221222101022 is 2201012221221.

It is a happy number.

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 = 1221222100986 and 1221222101004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2427147 + ... + 2886777.

It is an arithmetic number, because the mean of its divisors is an integer number (18069053184).

Almost surely, 2^{1221222101022} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221222101022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1734629105664).

1221222101022 is an abundant number, since it is smaller than the sum of its proper divisors (2248036110306).

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

1221222101022 is a wasteful number, since it uses less digits than its factorization.

1221222101022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459737 (or 459725 counting only the distinct ones).

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

Adding to 1221222101022 its reverse (2201012221221), we get a palindrome (3422234322243).

The spelling of 1221222101022 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred one thousand, twenty-two".