1153213220 has 24 divisors (see below), whose sum is σ = 2467443384. Its totient is φ = 452581376.

The previous prime is 1153213211. The next prime is 1153213223. The reversal of 1153213220 is 223123511.

It can be written as a sum of positive squares in 4 ways, for example, as 492928804 + 660284416 = 22202^2 + 25696^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1153213192 and 1153213201.

It is not an unprimeable number, because it can be changed into a prime (1153213223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542909 + ... + 545028.

It is an arithmetic number, because the mean of its divisors is an integer number (102810141).

Almost surely, 2^1153213220 is an apocalyptic number.

1153213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1153213220 is an abundant number, since it is smaller than the sum of its proper divisors (1314230164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1153213220 is a wasteful number, since it uses less digits than its factorization.

1153213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087999 (or 1087997 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1153213220 is about 33958.9932124025. The cubic root of 1153213220 is about 1048.6644304103.

Adding to 1153213220 its reverse (223123511), we get a palindrome (1376336731).

The spelling of 1153213220 in words is "one billion, one hundred fifty-three million, two hundred thirteen thousand, two hundred twenty".