2120320121 has 4 divisors (see below), whose sum is σ = 2245044852. Its totient is φ = 1995595392.

The previous prime is 2120320109. The next prime is 2120320127. The reversal of 2120320121 is 1210230212.

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 830073721 + 1290246400 = 28811^2 + 35920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120320121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120320096 and 2120320105.

It is not an unprimeable number, because it can be changed into a prime (2120320127) 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, 62362340 + ... + 62362373.

It is an arithmetic number, because the mean of its divisors is an integer number (561261213).

Almost surely, 2^2120320121 is an apocalyptic number.

It is an amenable number.

2120320121 is a deficient number, since it is larger than the sum of its proper divisors (124724731).

2120320121 is a wasteful number, since it uses less digits than its factorization.

2120320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124724730.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2120320121 is about 46046.9338935830. The cubic root of 2120320121 is about 1284.6963144536.

Adding to 2120320121 its reverse (1210230212), we get a palindrome (3330550333).

The spelling of 2120320121 in words is "two billion, one hundred twenty million, three hundred twenty thousand, one hundred twenty-one".