1152220221 has 28 divisors (see below), whose sum is σ = 1744755900. Its totient is φ = 760492800.

The previous prime is 1152220189. The next prime is 1152220241. The reversal of 1152220221 is 1220222511.

It can be written as a sum of positive squares in 2 ways, for example, as 702992196 + 449228025 = 26514^2 + 21195^2 .

It is not a de Polignac number, because 1152220221 - 2⁵ = 1152220189 is a prime.

It is a super-2 number, since 2×1152220221² = 2655222875362577682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1152220194 and 1152220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1152220241) 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 27 ways as a sum of consecutive naturals, for example, 65805 + ... + 81453.

Almost surely, 2^1152220221 is an apocalyptic number.

It is an amenable number.

1152220221 is a deficient number, since it is larger than the sum of its proper divisors (592535679).

1152220221 is an equidigital number, since it uses as much as digits as its factorization.

1152220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15768 (or 15753 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1152220221 is about 33944.3695036452. The cubic root of 1152220221 is about 1048.3633523037.

Adding to 1152220221 its reverse (1220222511), we get a palindrome (2372442732).

The spelling of 1152220221 in words is "one billion, one hundred fifty-two million, two hundred twenty thousand, two hundred twenty-one".