2101121121220 has 48 divisors (see below), whose sum is σ = 4904297834688. Its totient is φ = 749628114560.

The previous prime is 2101121121161. The next prime is 2101121121347. The reversal of 2101121121220 is 221211211012.

It is a junction number, because it is equal to n+sod(n) for n = 2101121121194 and 2101121121203.

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 15 ways as a sum of consecutive naturals, for example, 90087874 + ... + 90111193.

It is an arithmetic number, because the mean of its divisors is an integer number (102172871556).

Almost surely, 2^{2101121121220} is an apocalyptic number.

2101121121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101121121220 is an abundant number, since it is smaller than the sum of its proper divisors (2803176713468).

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

2101121121220 is a wasteful number, since it uses less digits than its factorization.

2101121121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180199140 (or 180199138 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2101121121220 its reverse (221211211012), we get a palindrome (2322332332232).

The spelling of 2101121121220 in words is "two trillion, one hundred one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".