1222012221 has 8 divisors (see below), whose sum is σ = 1629863520. Its totient is φ = 814417872.

The previous prime is 1222012201. The next prime is 1222012249. The reversal of 1222012221 is 1222102221.

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

It is not a de Polignac number, because 1222012221 - 2¹⁷ = 1221881149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222012201) 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 7 ways as a sum of consecutive naturals, for example, 52851 + ... + 72368.

It is an arithmetic number, because the mean of its divisors is an integer number (203732940).

Almost surely, 2^1222012221 is an apocalyptic number.

It is an amenable number.

1222012221 is a deficient number, since it is larger than the sum of its proper divisors (407851299).

1222012221 is a wasteful number, since it uses less digits than its factorization.

1222012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128475.

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

The square root of 1222012221 is about 34957.2913853462. The cubic root of 1222012221 is about 1069.1168713885.

Adding to 1222012221 its reverse (1222102221), we get a palindrome (2444114442).

Subtracting 1222012221 from its reverse (1222102221), we obtain a square (90000 = 300²).

The spelling of 1222012221 in words is "one billion, two hundred twenty-two million, twelve thousand, two hundred twenty-one".