1245452221 has 4 divisors (see below), whose sum is σ = 1341256252. Its totient is φ = 1149648192.

The previous prime is 1245452177. The next prime is 1245452237. The reversal of 1245452221 is 1222545421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190826596 + 1054625625 = 13814^2 + 32475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245452221 - 2¹⁷ = 1245321149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245452221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245452281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47901996 + ... + 47902021.

It is an arithmetic number, because the mean of its divisors is an integer number (335314063).

Almost surely, 2^1245452221 is an apocalyptic number.

It is an amenable number.

1245452221 is a deficient number, since it is larger than the sum of its proper divisors (95804031).

1245452221 is an equidigital number, since it uses as much as digits as its factorization.

1245452221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95804030.

The product of its digits is 6400, while the sum is 28.

The square root of 1245452221 is about 35290.9651469041. The cubic root of 1245452221 is about 1075.9093717863.

Adding to 1245452221 its reverse (1222545421), we get a palindrome (2467997642).

The spelling of 1245452221 in words is "one billion, two hundred forty-five million, four hundred fifty-two thousand, two hundred twenty-one".