1222011220221 has 32 divisors (see below), whose sum is σ = 1979681356800. Its totient is φ = 738845213040.

The previous prime is 1222011220187. The next prime is 1222011220229. The reversal of 1222011220221 is 1220221102221.

It is a happy number.

1222011220221 is a `hidden beast` number, since 1 + 2 + 220 + 1 + 1 + 220 + 221 = 666.

It is not a de Polignac number, because 1222011220221 - 2⁷ = 1222011220093 is a prime.

It is a super-2 number, since 2×1222011220221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1222011220194 and 1222011220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222011220229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4785481 + ... + 5034366.

It is an arithmetic number, because the mean of its divisors is an integer number (61865042400).

Almost surely, 2^{1222011220221} is an apocalyptic number.

1222011220221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222011220221 is a deficient number, since it is larger than the sum of its proper divisors (757670136579).

1222011220221 is a wasteful number, since it uses less digits than its factorization.

1222011220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9820286 (or 9820280 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1222011220221 its reverse (1220221102221), we get a palindrome (2442232322442).

The spelling of 1222011220221 in words is "one trillion, two hundred twenty-two billion, eleven million, two hundred twenty thousand, two hundred twenty-one".