2100120021121 has 4 divisors (see below), whose sum is σ = 2100163265200. Its totient is φ = 2100076777044.

The previous prime is 2100120021079. The next prime is 2100120021157. The reversal of 2100120021121 is 1211200210012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2100120021121 - 2¹⁹ = 2100119496833 is a prime.

It is a super-2 number, since 2×2100120021121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100120021421) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21549111 + ... + 21646348.

It is an arithmetic number, because the mean of its divisors is an integer number (525040816300).

Almost surely, 2^{2100120021121} is an apocalyptic number.

It is an amenable number.

2100120021121 is a deficient number, since it is larger than the sum of its proper divisors (43244079).

2100120021121 is an equidigital number, since it uses as much as digits as its factorization.

2100120021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43244078.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2100120021121 its reverse (1211200210012), we get a palindrome (3311320231133).

The spelling of 2100120021121 in words is "two trillion, one hundred billion, one hundred twenty million, twenty-one thousand, one hundred twenty-one".