2124012221 has 2 divisors, whose sum is σ = 2124012222. Its totient is φ = 2124012220.

The previous prime is 2124012217. The next prime is 2124012227. The reversal of 2124012221 is 1222104212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1438305625 + 685706596 = 37925^2 + 26186^2 .

It is a cyclic number.

It is not a de Polignac number, because 2124012221 - 2² = 2124012217 is a prime.

It is a super-2 number, since 2×2124012221² = 9022855829914705682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2124012221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2124012227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062006110 + 1062006111.

It is an arithmetic number, because the mean of its divisors is an integer number (1062006111).

Almost surely, 2^2124012221 is an apocalyptic number.

It is an amenable number.

2124012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2124012221 is an equidigital number, since it uses as much as digits as its factorization.

2124012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2124012221 is about 46087.0070735777. The cubic root of 2124012221 is about 1285.4415599095.

Adding to 2124012221 its reverse (1222104212), we get a palindrome (3346116433).

The spelling of 2124012221 in words is "two billion, one hundred twenty-four million, twelve thousand, two hundred twenty-one".