2120231221 has 2 divisors, whose sum is σ = 2120231222. Its totient is φ = 2120231220.

The previous prime is 2120231219. The next prime is 2120231233. The reversal of 2120231221 is 1221320212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1865030596 + 255200625 = 43186^2 + 15975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120231221 - 2¹ = 2120231219 is a prime.

Together with 2120231219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2120231195 and 2120231204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120231821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060115610 + 1060115611.

It is an arithmetic number, because the mean of its divisors is an integer number (1060115611).

Almost surely, 2^2120231221 is an apocalyptic number.

It is an amenable number.

2120231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120231221 is an equidigital number, since it uses as much as digits as its factorization.

2120231221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2120231221 is about 46045.9685640339. The cubic root of 2120231221 is about 1284.6783594449.

Adding to 2120231221 its reverse (1221320212), we get a palindrome (3341551433).

The spelling of 2120231221 in words is "two billion, one hundred twenty million, two hundred thirty-one thousand, two hundred twenty-one".