1220221000100 has 72 divisors (see below), whose sum is σ = 2787474298560. Its totient is φ = 462360942720.

The previous prime is 1220221000093. The next prime is 1220221000109. The reversal of 1220221000100 is 10001220221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1220221000109) 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, 34328537 + ... + 34364063.

Almost surely, 2^{1220221000100} is an apocalyptic number.

1220221000100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221000100 is an abundant number, since it is smaller than the sum of its proper divisors (1567253298460).

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

1220221000100 is a wasteful number, since it uses less digits than its factorization.

1220221000100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53637 (or 53630 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1220221000100 its reverse (10001220221), we get a palindrome (1230222220321).

The spelling of 1220221000100 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred", and thus it is an aban number.