4221221225 has 24 divisors (see below), whose sum is σ = 5640185880. Its totient is φ = 3115422720.

The previous prime is 4221221197. The next prime is 4221221287. The reversal of 4221221225 is 5221221224.

It can be written as a sum of positive squares in 12 ways, for example, as 2509909801 + 1711311424 = 50099^2 + 41368^2 .

It is not a de Polignac number, because 4221221225 - 2¹⁸ = 4220959081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4221221225.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 904097 + ... + 908753.

It is an arithmetic number, because the mean of its divisors is an integer number (235007745).

Almost surely, 2^4221221225 is an apocalyptic number.

It is an amenable number.

4221221225 is a deficient number, since it is larger than the sum of its proper divisors (1418964655).

4221221225 is a wasteful number, since it uses less digits than its factorization.

4221221225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7469 (or 7464 counting only the distinct ones).

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

The square root of 4221221225 is about 64970.9259977107. The cubic root of 4221221225 is about 1616.1414577394.

Adding to 4221221225 its reverse (5221221224), we get a palindrome (9442442449).

Subtracting 4221221225 from its reverse (5221221224), we obtain a palindrome (999999999).

The spelling of 4221221225 in words is "four billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-five".