1220202100100 has 36 divisors (see below), whose sum is σ = 2651844508068. Its totient is φ = 487342416000.

The previous prime is 1220202100079. The next prime is 1220202100151. The reversal of 1220202100100 is 10012020221.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 62667111556 + 1157534988544 = 250334^2 + 1075888^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9163871 + ... + 9296070.

Almost surely, 2^{1220202100100} is an apocalyptic number.

1220202100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220202100100 is an abundant number, since it is smaller than the sum of its proper divisors (1431642407968).

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

1220202100100 is a wasteful number, since it uses less digits than its factorization.

1220202100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18460616 (or 18460609 counting only the distinct ones).

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

Adding to 1220202100100 its reverse (10012020221), we get a palindrome (1230214120321).

The spelling of 1220202100100 in words is "one trillion, two hundred twenty billion, two hundred two million, one hundred thousand, one hundred".