1221200201 has 8 divisors (see below), whose sum is σ = 1343121024. Its totient is φ = 1103276880.

The previous prime is 1221200161. The next prime is 1221200273. The reversal of 1221200201 is 1020021221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221200201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221203201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998735 + ... + 999956.

It is an arithmetic number, because the mean of its divisors is an integer number (167890128).

Almost surely, 2^1221200201 is an apocalyptic number.

It is an amenable number.

1221200201 is a deficient number, since it is larger than the sum of its proper divisors (121920823).

1221200201 is a wasteful number, since it uses less digits than its factorization.

1221200201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998751.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221200201 is about 34945.6749970579. The cubic root of 1221200201 is about 1068.8800116064.

Adding to 1221200201 its reverse (1020021221), we get a palindrome (2241221422).

The spelling of 1221200201 in words is "one billion, two hundred twenty-one million, two hundred thousand, two hundred one".