1200212221 has 4 divisors (see below), whose sum is σ = 1292536252. Its totient is φ = 1107888192.

The previous prime is 1200212207. The next prime is 1200212231. The reversal of 1200212221 is 1222120021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 544288900 + 655923321 = 23330^2 + 25611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200212221 - 2⁷ = 1200212093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 92324017 = 1200212221 / (1 + 2 + 0 + 0 + 2 + 1 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200212231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46161996 + ... + 46162021.

It is an arithmetic number, because the mean of its divisors is an integer number (323134063).

Almost surely, 2^1200212221 is an apocalyptic number.

It is an amenable number.

1200212221 is a deficient number, since it is larger than the sum of its proper divisors (92324031).

1200212221 is an equidigital number, since it uses as much as digits as its factorization.

1200212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92324030.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1200212221 is about 34644.0791622465. The cubic root of 1200212221 is about 1062.7212095079.

Adding to 1200212221 its reverse (1222120021), we get a palindrome (2422332242).

The spelling of 1200212221 in words is "one billion, two hundred million, two hundred twelve thousand, two hundred twenty-one".