1100221020 has 36 divisors (see below), whose sum is σ = 3337337640. Its totient is φ = 293392224.

The previous prime is 1100221013. The next prime is 1100221063. The reversal of 1100221020 is 201220011.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1100220993 and 1100221011.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 3055990 + ... + 3056349.

Almost surely, 2^1100221020 is an apocalyptic number.

1100221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1100221020 is an abundant number, since it is smaller than the sum of its proper divisors (2237116620).

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

1100221020 is a wasteful number, since it uses less digits than its factorization.

1100221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6112354 (or 6112349 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1100221020 is about 33169.5797380672. The cubic root of 1100221020 is about 1032.3492485691.

Adding to 1100221020 its reverse (201220011), we get a palindrome (1301441031).

The spelling of 1100221020 in words is "one billion, one hundred million, two hundred twenty-one thousand, twenty".