2120221121 has 4 divisors (see below), whose sum is σ = 2212404672. Its totient is φ = 2028037572.

The previous prime is 2120221073. The next prime is 2120221123. The reversal of 2120221121 is 1211220212.

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 a de Polignac number, because none of the positive numbers 2^k-2120221121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120221096 and 2120221105.

It is not an unprimeable number, because it can be changed into a prime (2120221123) 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, 46091741 + ... + 46091786.

It is an arithmetic number, because the mean of its divisors is an integer number (553101168).

Almost surely, 2^2120221121 is an apocalyptic number.

It is an amenable number.

2120221121 is a deficient number, since it is larger than the sum of its proper divisors (92183551).

2120221121 is an equidigital number, since it uses as much as digits as its factorization.

2120221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92183550.

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

The square root of 2120221121 is about 46045.8588908927. The cubic root of 2120221121 is about 1284.6763195303.

Adding to 2120221121 its reverse (1211220212), we get a palindrome (3331441333).

Subtracting from 2120221121 its reverse (1211220212), we obtain a palindrome (909000909).

The spelling of 2120221121 in words is "two billion, one hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".