20101121221200 has 120 divisors (see below), whose sum is σ = 66467707627776. Its totient is φ = 5187386112000.

The previous prime is 20101121221147. The next prime is 20101121221241. The reversal of 20101121221200 is 212212110102.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20101121221200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270139161 + ... + 270213560.

Almost surely, 2^{20101121221200} is an apocalyptic number.

20101121221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101121221200 is an abundant number, since it is smaller than the sum of its proper divisors (46366586406576).

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

20101121221200 is a wasteful number, since it uses less digits than its factorization.

20101121221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540352773 (or 540352762 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20101121221200 its reverse (212212110102), we get a palindrome (20313333331302).

The spelling of 20101121221200 in words is "twenty trillion, one hundred one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred".