1221243152 has 10 divisors (see below), whose sum is σ = 2366158638. Its totient is φ = 610621568.

The previous prime is 1221243151. The next prime is 1221243209. The reversal of 1221243152 is 2513421221.

It can be written as a sum of positive squares in only one way, i.e., 1209926656 + 11316496 = 34784^2 + 3364^2 .

It is not an unprimeable number, because it can be changed into a prime (1221243151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38163833 + ... + 38163864.

Almost surely, 2^1221243152 is an apocalyptic number.

It is an amenable number.

1221243152 is a deficient number, since it is larger than the sum of its proper divisors (1144915486).

1221243152 is an equidigital number, since it uses as much as digits as its factorization.

1221243152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76327705 (or 76327699 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 1221243152 is about 34946.2895312221. The cubic root of 1221243152 is about 1068.8925427013.

Adding to 1221243152 its reverse (2513421221), we get a palindrome (3734664373).

The spelling of 1221243152 in words is "one billion, two hundred twenty-one million, two hundred forty-three thousand, one hundred fifty-two".