1100021320 has 16 divisors (see below), whose sum is σ = 2475048060. Its totient is φ = 440008512.

The previous prime is 1100021317. The next prime is 1100021339. The reversal of 1100021320 is 231200011.

It can be written as a sum of positive squares in 2 ways, for example, as 1086757156 + 13264164 = 32966^2 + 3642^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1100021297 and 1100021306.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13750227 + ... + 13750306.

Almost surely, 2^1100021320 is an apocalyptic number.

1100021320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1100021320 is an abundant number, since it is smaller than the sum of its proper divisors (1375026740).

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

1100021320 is a wasteful number, since it uses less digits than its factorization.

1100021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27500544 (or 27500540 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1100021320 is about 33166.5693130900. The cubic root of 1100021320 is about 1032.2867845685.

Adding to 1100021320 its reverse (231200011), we get a palindrome (1331221331).

The spelling of 1100021320 in words is "one billion, one hundred million, twenty-one thousand, three hundred twenty".