1222221012100 has 108 divisors (see below), whose sum is σ = 2924632436544. Its totient is φ = 443013560000.

The previous prime is 1222221012083. The next prime is 1222221012109. The reversal of 1222221012100 is 12101222221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1222221012109) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3600705 + ... + 3925495.

It is an arithmetic number, because the mean of its divisors is an integer number (27079929968).

Almost surely, 2^{1222221012100} is an apocalyptic number.

1222221012100 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 1222221012100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1462316218272).

1222221012100 is an abundant number, since it is smaller than the sum of its proper divisors (1702411424444).

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

1222221012100 is a wasteful number, since it uses less digits than its factorization.

1222221012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325138 (or 325120 counting only the distinct ones).

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

Adding to 1222221012100 its reverse (12101222221), we get a palindrome (1234322234321).

The spelling of 1222221012100 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-one million, twelve thousand, one hundred".