1212004221 has 16 divisors (see below), whose sum is σ = 1672963200. Its totient is φ = 779565248.

The previous prime is 1212004219. The next prime is 1212004223. The reversal of 1212004221 is 1224002121.

It is an interprime number because it is at equal distance from previous prime (1212004219) and next prime (1212004223).

It is a cyclic number.

It is not a de Polignac number, because 1212004221 - 2¹ = 1212004219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212004221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212004223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135475 + ... + 144143.

It is an arithmetic number, because the mean of its divisors is an integer number (104560200).

Almost surely, 2^1212004221 is an apocalyptic number.

It is an amenable number.

1212004221 is a deficient number, since it is larger than the sum of its proper divisors (460958979).

1212004221 is a wasteful number, since it uses less digits than its factorization.

1212004221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10308.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1212004221 is about 34813.8509935342. The cubic root of 1212004221 is about 1066.1902599858.

Adding to 1212004221 its reverse (1224002121), we get a palindrome (2436006342).

The spelling of 1212004221 in words is "one billion, two hundred twelve million, four thousand, two hundred twenty-one".