1245052221 has 24 divisors (see below), whose sum is σ = 1941930720. Its totient is φ = 707468832.

The previous prime is 1245052219. The next prime is 1245052253. The reversal of 1245052221 is 1222505421.

It is not a de Polignac number, because 1245052221 - 2¹ = 1245052219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1245052191 and 1245052200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245052021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2655 + ... + 49971.

It is an arithmetic number, because the mean of its divisors is an integer number (80913780).

Almost surely, 2^1245052221 is an apocalyptic number.

It is an amenable number.

1245052221 is a deficient number, since it is larger than the sum of its proper divisors (696878499).

1245052221 is a wasteful number, since it uses less digits than its factorization.

1245052221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47513 (or 47506 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1245052221 is about 35285.2975189384. The cubic root of 1245052221 is about 1075.7941767263.

Adding to 1245052221 its reverse (1222505421), we get a palindrome (2467557642).

The spelling of 1245052221 in words is "one billion, two hundred forty-five million, fifty-two thousand, two hundred twenty-one".