1222122222100 has 72 divisors (see below), whose sum is σ = 2861134797528. Its totient is φ = 450434726400.

The previous prime is 1222122222089. The next prime is 1222122222131. The reversal of 1222122222100 is 12222212221.

It can be written as a sum of positive squares in 12 ways, for example, as 966233952784 + 255888269316 = 982972^2 + 505854^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119791 + ... + 1567990.

It is an arithmetic number, because the mean of its divisors is an integer number (39737983299).

Almost surely, 2^{1222122222100} is an apocalyptic number.

1222122222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222122222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1430567398764).

1222122222100 is an abundant number, since it is smaller than the sum of its proper divisors (1639012575428).

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

1222122222100 is a wasteful number, since it uses less digits than its factorization.

1222122222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688365 (or 1688358 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1222122222100 its reverse (12222212221), we get a palindrome (1234344434321).

The spelling of 1222122222100 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred".