1201221201100 has 18 divisors (see below), whose sum is σ = 2606650006604. Its totient is φ = 480488480400.

The previous prime is 1201221201097. The next prime is 1201221201107. The reversal of 1201221201100 is 11021221021.

It is not an unprimeable number, because it can be changed into a prime (1201221201107) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6006105906 + ... + 6006106105.

Almost surely, 2^{1201221201100} is an apocalyptic number.

1201221201100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201221201100 is an abundant number, since it is smaller than the sum of its proper divisors (1405428805504).

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

1201221201100 is a wasteful number, since it uses less digits than its factorization.

1201221201100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12012212025 (or 12012212018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1201221201100 its reverse (11021221021), we get a palindrome (1212242422121).

The spelling of 1201221201100 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred one thousand, one hundred".