1222201221 has 8 divisors (see below), whose sum is σ = 1639599840. Its totient is φ = 809801712.

The previous prime is 1222201217. The next prime is 1222201223. The reversal of 1222201221 is 1221022221.

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

It is not a de Polignac number, because 1222201221 - 2² = 1222201217 is a prime.

It is a super-2 number, since 2×1222201221² = 2987551649227781682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1222201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222201223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1249206 + ... + 1250183.

It is an arithmetic number, because the mean of its divisors is an integer number (204949980).

Almost surely, 2^1222201221 is an apocalyptic number.

It is an amenable number.

1222201221 is a deficient number, since it is larger than the sum of its proper divisors (417398619).

1222201221 is a wasteful number, since it uses less digits than its factorization.

1222201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499555.

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

The square root of 1222201221 is about 34959.9945795190. The cubic root of 1222201221 is about 1069.1719861325.

Adding to 1222201221 its reverse (1221022221), we get a palindrome (2443223442).

The spelling of 1222201221 in words is "one billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".