1120021020 has 84 divisors (see below), whose sum is σ = 3526498920. Its totient is φ = 298668384.

The previous prime is 1120021009. The next prime is 1120021099. The reversal of 1120021020 is 201200211.

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

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 1120020993 and 1120021011.

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 27 ways as a sum of consecutive naturals, for example, 23830 + ... + 52989.

It is an arithmetic number, because the mean of its divisors is an integer number (41982130).

Almost surely, 2^1120021020 is an apocalyptic number.

1120021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1120021020 is an abundant number, since it is smaller than the sum of its proper divisors (2406477900).

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

1120021020 is an equidigital number, since it uses as much as digits as its factorization.

1120021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76846 (or 76829 counting only the distinct ones).

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

The square root of 1120021020 is about 33466.7151062066. The cubic root of 1120021020 is about 1038.5053171287.

Adding to 1120021020 its reverse (201200211), we get a palindrome (1321221231).

The spelling of 1120021020 in words is "one billion, one hundred twenty million, twenty-one thousand, twenty".