1001201221100 has 54 divisors (see below), whose sum is σ = 2177416534860. Its totient is φ = 399595827840.

The previous prime is 1001201221051. The next prime is 1001201221121. The reversal of 1001201221100 is 11221021001.

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 17 ways as a sum of consecutive naturals, for example, 20860931 + ... + 20908869.

Almost surely, 2^{1001201221100} is an apocalyptic number.

1001201221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001201221100 is an abundant number, since it is smaller than the sum of its proper divisors (1176215313760).

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

1001201221100 is an equidigital number, since it uses as much as digits as its factorization.

1001201221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48867 (or 48403 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1001201221100 its reverse (11221021001), we get a palindrome (1012422242101).

The spelling of 1001201221100 in words is "one trillion, one billion, two hundred one million, two hundred twenty-one thousand, one hundred".