1200021200 has 60 divisors (see below), whose sum is σ = 3294923040. Its totient is φ = 411434880.

The previous prime is 1200021187. The next prime is 1200021217. The reversal of 1200021200 is 21200021.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

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, 211490 + ... + 217089.

It is an arithmetic number, because the mean of its divisors is an integer number (54915384).

Almost surely, 2^1200021200 is an apocalyptic number.

1200021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200021200 is an abundant number, since it is smaller than the sum of its proper divisors (2094901840).

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

1200021200 is a wasteful number, since it uses less digits than its factorization.

1200021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428604 (or 428593 counting only the distinct ones).

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

The square root of 1200021200 is about 34641.3221456687. The cubic root of 1200021200 is about 1062.6648270240.

Adding to 1200021200 its reverse (21200021), we get a palindrome (1221221221).

The spelling of 1200021200 in words is "one billion, two hundred million, twenty-one thousand, two hundred".