2142444221 has 2 divisors, whose sum is σ = 2142444222. Its totient is φ = 2142444220.

The previous prime is 2142444209. The next prime is 2142444229. The reversal of 2142444221 is 1224442412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2124288100 + 18156121 = 46090^2 + 4261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142444221 - 2²⁶ = 2075335357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2142444229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071222110 + 1071222111.

It is an arithmetic number, because the mean of its divisors is an integer number (1071222111).

It is a self-describing number.

Almost surely, 2^2142444221 is an apocalyptic number.

It is an amenable number.

2142444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142444221 is an equidigital number, since it uses as much as digits as its factorization.

2142444221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4096, while the sum is 26.

The square root of 2142444221 is about 46286.5447079386. The cubic root of 2142444221 is about 1289.1491737480.

Adding to 2142444221 its reverse (1224442412), we get a palindrome (3366886633).

The spelling of 2142444221 in words is "two billion, one hundred forty-two million, four hundred forty-four thousand, two hundred twenty-one".