2120012221121 has 4 divisors (see below), whose sum is σ = 2125695900372. Its totient is φ = 2114328541872.

The previous prime is 2120012221057. The next prime is 2120012221123. The reversal of 2120012221121 is 1211222100212.

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 429076091521 + 1690936129600 = 655039^2 + 1300360^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120012221121 - 2⁶ = 2120012221057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120012221121.

It is not an unprimeable number, because it can be changed into a prime (2120012221123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2841839066 + ... + 2841839811.

It is an arithmetic number, because the mean of its divisors is an integer number (531423975093).

Almost surely, 2^{2120012221121} is an apocalyptic number.

It is an amenable number.

2120012221121 is a deficient number, since it is larger than the sum of its proper divisors (5683679251).

2120012221121 is an equidigital number, since it uses as much as digits as its factorization.

2120012221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683679250.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2120012221121 its reverse (1211222100212), we get a palindrome (3331234321333).

The spelling of 2120012221121 in words is "two trillion, one hundred twenty billion, twelve million, two hundred twenty-one thousand, one hundred twenty-one".