1201021120 has 112 divisors (see below), whose sum is σ = 3091586400. Its totient is φ = 441778176.

The previous prime is 1201021111. The next prime is 1201021139. The reversal of 1201021120 is 211201021.

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 = 1201021097 and 1201021106.

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 15 ways as a sum of consecutive naturals, for example, 1867519 + ... + 1868161.

It is an arithmetic number, because the mean of its divisors is an integer number (27603450).

Almost surely, 2^1201021120 is an apocalyptic number.

1201021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545793200).

1201021120 is an abundant number, since it is smaller than the sum of its proper divisors (1890565280).

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

1201021120 is a wasteful number, since it uses less digits than its factorization.

1201021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1201021120 is about 34655.7516149917. The cubic root of 1201021120 is about 1062.9599009272.

Adding to 1201021120 its reverse (211201021), we get a palindrome (1412222141).

The spelling of 1201021120 in words is "one billion, two hundred one million, twenty-one thousand, one hundred twenty".