2120013221 has 4 divisors (see below), whose sum is σ = 2149054572. Its totient is φ = 2090971872.

The previous prime is 2120013209. The next prime is 2120013223. The reversal of 2120013221 is 1223100212.

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 1030089025 + 1089924196 = 32095^2 + 33014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120013221 - 2⁶ = 2120013157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120013196 and 2120013205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120013223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14520566 + ... + 14520711.

It is an arithmetic number, because the mean of its divisors is an integer number (537263643).

Almost surely, 2^2120013221 is an apocalyptic number.

It is an amenable number.

2120013221 is a deficient number, since it is larger than the sum of its proper divisors (29041351).

2120013221 is an equidigital number, since it uses as much as digits as its factorization.

2120013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29041350.

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

The square root of 2120013221 is about 46043.6013035471. The cubic root of 2120013221 is about 1284.6343281653.

Adding to 2120013221 its reverse (1223100212), we get a palindrome (3343113433).

The spelling of 2120013221 in words is "two billion, one hundred twenty million, thirteen thousand, two hundred twenty-one".