2120365121 has 4 divisors (see below), whose sum is σ = 2423274432. Its totient is φ = 1817455812.

The previous prime is 2120365111. The next prime is 2120365123. The reversal of 2120365121 is 1215630212.

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 2120365121 - 2¹⁸ = 2120102977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2120365123) 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, 151454645 + ... + 151454658.

It is an arithmetic number, because the mean of its divisors is an integer number (605818608).

Almost surely, 2^2120365121 is an apocalyptic number.

It is an amenable number.

2120365121 is a deficient number, since it is larger than the sum of its proper divisors (302909311).

2120365121 is an equidigital number, since it uses as much as digits as its factorization.

2120365121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302909310.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2120365121 is about 46047.4225228731. The cubic root of 2120365121 is about 1284.7054028494.

Adding to 2120365121 its reverse (1215630212), we get a palindrome (3335995333).

The spelling of 2120365121 in words is "two billion, one hundred twenty million, three hundred sixty-five thousand, one hundred twenty-one".