1222110211221 has 12 divisors (see below), whose sum is σ = 1765546686540. Its totient is φ = 814612580160.

The previous prime is 1222110211219. The next prime is 1222110211253. The reversal of 1222110211221 is 1221120112221.

1222110211221 is a `hidden beast` number, since 1 + 2 + 221 + 10 + 211 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 203413628196 + 1018696583025 = 451014^2 + 1009305^2 .

It is not a de Polignac number, because 1222110211221 - 2¹ = 1222110211219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222110211194 and 1222110211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222110211321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10569360 + ... + 10684361.

It is an arithmetic number, because the mean of its divisors is an integer number (147128890545).

Almost surely, 2^{1222110211221} is an apocalyptic number.

It is an amenable number.

1222110211221 is a deficient number, since it is larger than the sum of its proper divisors (543436475319).

1222110211221 is a wasteful number, since it uses less digits than its factorization.

1222110211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21260116 (or 21260113 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1222110211221 its reverse (1221120112221), we get a palindrome (2443230323442).

The spelling of 1222110211221 in words is "one trillion, two hundred twenty-two billion, one hundred ten million, two hundred eleven thousand, two hundred twenty-one".