2120212221 has 16 divisors (see below), whose sum is σ = 2914689984. Its totient is φ = 1369903104.

The previous prime is 2120212187. The next prime is 2120212229. The reversal of 2120212221 is 1222120212.

It is not a de Polignac number, because 2120212221 - 2⁷ = 2120212093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120212229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8635 + ... + 65688.

It is an arithmetic number, because the mean of its divisors is an integer number (182168124).

Almost surely, 2^2120212221 is an apocalyptic number.

It is an amenable number.

2120212221 is a deficient number, since it is larger than the sum of its proper divisors (794477763).

2120212221 is a wasteful number, since it uses less digits than its factorization.

2120212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74620.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2120212221 is about 46045.7622480071. The cubic root of 2120212221 is about 1284.6745219764.

Adding to 2120212221 its reverse (1222120212), we get a palindrome (3342332433).

The spelling of 2120212221 in words is "two billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".