1212201222100 has 36 divisors (see below), whose sum is σ = 2869610895648. Its totient is φ = 440800444000.

The previous prime is 1212201222053. The next prime is 1212201222157. The reversal of 1212201222100 is 12221022121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 550999456 + ... + 551001655.

It is an arithmetic number, because the mean of its divisors is an integer number (79711413768).

Almost surely, 2^{1212201222100} is an apocalyptic number.

1212201222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212201222100 is an abundant number, since it is smaller than the sum of its proper divisors (1657409673548).

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

1212201222100 is a wasteful number, since it uses less digits than its factorization.

1212201222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102001136 (or 1102001129 counting only the distinct ones).

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

Adding to 1212201222100 its reverse (12221022121), we get a palindrome (1224422244221).

The spelling of 1212201222100 in words is "one trillion, two hundred twelve billion, two hundred one million, two hundred twenty-two thousand, one hundred".