1222011221 has 8 divisors (see below), whose sum is σ = 1306706904. Its totient is φ = 1138739200.

The previous prime is 1222011199. The next prime is 1222011223. The reversal of 1222011221 is 1221102221.

It can be written as a sum of positive squares in 4 ways, for example, as 500014321 + 721996900 = 22361^2 + 26870^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1222011221 - 2¹⁰ = 1222010197 is a prime.

It is a super-2 number, since 2×1222011221² = 2986622848499821682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1222011196 and 1222011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222011223) 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, 354140 + ... + 357573.

It is an arithmetic number, because the mean of its divisors is an integer number (163338363).

Almost surely, 2^1222011221 is an apocalyptic number.

It is an amenable number.

1222011221 is a deficient number, since it is larger than the sum of its proper divisors (84695683).

1222011221 is a wasteful number, since it uses less digits than its factorization.

1222011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711831.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1222011221 is about 34957.2770821756. The cubic root of 1222011221 is about 1069.1165797609.

Adding to 1222011221 its reverse (1221102221), we get a palindrome (2443113442).

The spelling of 1222011221 in words is "one billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".