2120221000121 has 12 divisors (see below), whose sum is σ = 2472719860260. Its totient is φ = 1812660464160.

The previous prime is 2120221000109. The next prime is 2120221000153. The reversal of 2120221000121 is 1210001220212.

It can be written as a sum of positive squares in 2 ways, for example, as 1132811120896 + 987409879225 = 1064336^2 + 993685^2 .

It is not a de Polignac number, because 2120221000121 - 2¹⁰ = 2120220999097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2120221000096 and 2120221000105.

It is not an unprimeable number, because it can be changed into a prime (2120221000621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55597670 + ... + 55635791.

It is an arithmetic number, because the mean of its divisors is an integer number (206059988355).

Almost surely, 2^{2120221000121} is an apocalyptic number.

It is an amenable number.

2120221000121 is a deficient number, since it is larger than the sum of its proper divisors (352498860139).

2120221000121 is a wasteful number, since it uses less digits than its factorization.

2120221000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111233864 (or 111233857 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2120221000121 its reverse (1210001220212), we get a palindrome (3330222220333).

The spelling of 2120221000121 in words is "two trillion, one hundred twenty billion, two hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.