2120002212121 has 4 divisors (see below), whose sum is σ = 2120006198052. Its totient is φ = 2119998226192.

The previous prime is 2120002212103. The next prime is 2120002212127. The reversal of 2120002212121 is 1212122000212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1955981262096 + 164020950025 = 1398564^2 + 404995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120002212121 - 2¹³ = 2120002203929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120002212095 and 2120002212104.

It is not an unprimeable number, because it can be changed into a prime (2120002212127) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1044790 + ... + 2309023.

It is an arithmetic number, because the mean of its divisors is an integer number (530001549513).

Almost surely, 2^{2120002212121} is an apocalyptic number.

It is an amenable number.

2120002212121 is a deficient number, since it is larger than the sum of its proper divisors (3985931).

2120002212121 is an equidigital number, since it uses as much as digits as its factorization.

2120002212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985930.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2120002212121 its reverse (1212122000212), we get a palindrome (3332124212333).

The spelling of 2120002212121 in words is "two trillion, one hundred twenty billion, two million, two hundred twelve thousand, one hundred twenty-one".