1222002021100 has 72 divisors (see below), whose sum is σ = 3033540840960. Its totient is φ = 418560717120.

The previous prime is 1222002021089. The next prime is 1222002021101. The reversal of 1222002021100 is 11202002221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1222002021101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143284 + ... + 1569883.

It is an arithmetic number, because the mean of its divisors is an integer number (42132511680).

Almost surely, 2^{1222002021100} is an apocalyptic number.

1222002021100 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 1222002021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516770420480).

1222002021100 is an abundant number, since it is smaller than the sum of its proper divisors (1811538819860).

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

1222002021100 is a wasteful number, since it uses less digits than its factorization.

1222002021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714207 (or 1714200 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1222002021100 its reverse (11202002221), we get a palindrome (1233204023321).

The spelling of 1222002021100 in words is "one trillion, two hundred twenty-two billion, two million, twenty-one thousand, one hundred".