1200222221 has 16 divisors (see below), whose sum is σ = 1339269120. Its totient is φ = 1066237680.

The previous prime is 1200222209. The next prime is 1200222251. The reversal of 1200222221 is 1222220021.

It is a cyclic number.

It is not a de Polignac number, because 1200222221 - 2¹⁸ = 1199960077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200222196 and 1200222205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200222251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432380 + ... + 435146.

It is an arithmetic number, because the mean of its divisors is an integer number (83704320).

Almost surely, 2^1200222221 is an apocalyptic number.

1200222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200222221 is a deficient number, since it is larger than the sum of its proper divisors (139046899).

1200222221 is a wasteful number, since it uses less digits than its factorization.

1200222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1200222221 is about 34644.2234867517. The cubic root of 1200222221 is about 1062.7241609811.

Adding to 1200222221 its reverse (1222220021), we get a palindrome (2422442242).

The spelling of 1200222221 in words is "one billion, two hundred million, two hundred twenty-two thousand, two hundred twenty-one".