21100121220000 has 120 divisors (see below), whose sum is σ = 69212617822656. Its totient is φ = 5626698976000.

The previous prime is 21100121219939. The next prime is 21100121220023. The reversal of 21100121220000 is 2212100112.

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 (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 175774344 + ... + 175894343.

Almost surely, 2^{21100121220000} is an apocalyptic number.

21100121220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100121220000 is an abundant number, since it is smaller than the sum of its proper divisors (48112496602656).

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

21100121220000 is an equidigital number, since it uses as much as digits as its factorization.

21100121220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351668720 (or 351668697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21100121220000 its reverse (2212100112), we get a palindrome (21102333320112).

The spelling of 21100121220000 in words is "twenty-one trillion, one hundred billion, one hundred twenty-one million, two hundred twenty thousand".