1200021120 has 96 divisors (see below), whose sum is σ = 4143842820. Its totient is φ = 320004096.

The previous prime is 1200021107. The next prime is 1200021149. The reversal of 1200021120 is 211200021.

It can be written as a sum of positive squares in 2 ways, for example, as 1196053056 + 3968064 = 34584^2 + 1992^2 .

It is a tau number, because it is divible by the number of its divisors (96).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98409 + ... + 109928.

Almost surely, 2^1200021120 is an apocalyptic number.

1200021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200021120 is an abundant number, since it is smaller than the sum of its proper divisors (2943821700).

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

1200021120 is a wasteful number, since it uses less digits than its factorization.

1200021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208362 (or 208347 counting only the distinct ones).

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

The square root of 1200021120 is about 34641.3209909784. The cubic root of 1200021120 is about 1062.6648034096.

Adding to 1200021120 its reverse (211200021), we get a palindrome (1411221141).

The spelling of 1200021120 in words is "one billion, two hundred million, twenty-one thousand, one hundred twenty".