2120031221 has 16 divisors (see below), whose sum is σ = 2647340928. Its totient is φ = 1649356800.

The previous prime is 2120031161. The next prime is 2120031299. The reversal of 2120031221 is 1221300212.

It is a happy number.

It is not a de Polignac number, because 2120031221 - 2¹⁴ = 2120014837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120031196 and 2120031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120031521) 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, 27881 + ... + 70833.

It is an arithmetic number, because the mean of its divisors is an integer number (165458808).

Almost surely, 2^2120031221 is an apocalyptic number.

It is an amenable number.

2120031221 is a deficient number, since it is larger than the sum of its proper divisors (527309707).

2120031221 is a wasteful number, since it uses less digits than its factorization.

2120031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43612.

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

The square root of 2120031221 is about 46043.7967700319. The cubic root of 2120031221 is about 1284.6379638898.

Adding to 2120031221 its reverse (1221300212), we get a palindrome (3341331433).

The spelling of 2120031221 in words is "two billion, one hundred twenty million, thirty-one thousand, two hundred twenty-one".