2125224221 has 2 divisors, whose sum is σ = 2125224222. Its totient is φ = 2125224220.

The previous prime is 2125224169. The next prime is 2125224229. The reversal of 2125224221 is 1224225212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1295208121 + 830016100 = 35989^2 + 28810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2125224221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2125224229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062612110 + 1062612111.

It is an arithmetic number, because the mean of its divisors is an integer number (1062612111).

Almost surely, 2^2125224221 is an apocalyptic number.

It is an amenable number.

2125224221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125224221 is an equidigital number, since it uses as much as digits as its factorization.

2125224221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 23.

The square root of 2125224221 is about 46100.1542405229. The cubic root of 2125224221 is about 1285.6860121960.

Adding to 2125224221 its reverse (1224225212), we get a palindrome (3349449433).

Subtracting from 2125224221 its reverse (1224225212), we obtain a palindrome (900999009).

The spelling of 2125224221 in words is "two billion, one hundred twenty-five million, two hundred twenty-four thousand, two hundred twenty-one".