201221101021100 has 72 divisors (see below), whose sum is σ = 451730677490400. Its totient is φ = 77708848089600.

The previous prime is 201221101021097. The next prime is 201221101021123. The reversal of 201221101021100 is 1120101122102.

It is a super-2 number, since 2×201221101021100² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53031320 + ... + 56698880.

Almost surely, 2^{201221101021100} is an apocalyptic number.

201221101021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221101021100 is an abundant number, since it is smaller than the sum of its proper divisors (250509576469300).

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

201221101021100 is a wasteful number, since it uses less digits than its factorization.

201221101021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3686523 (or 3686516 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201221101021100 its reverse (1120101122102), we get a palindrome (202341202143202).

The spelling of 201221101021100 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred one million, twenty-one thousand, one hundred".