1220202112221 has 16 divisors (see below), whose sum is σ = 1808107214400. Its totient is φ = 813287903184.

The previous prime is 1220202112211. The next prime is 1220202112223. The reversal of 1220202112221 is 1222112020221.

It is a happy number.

It is not a de Polignac number, because 1220202112221 - 2¹⁴ = 1220202095837 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220202112194 and 1220202112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220202112223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4880551 + ... + 5124468.

It is an arithmetic number, because the mean of its divisors is an integer number (113006700900).

Almost surely, 2^{1220202112221} is an apocalyptic number.

It is an amenable number.

1220202112221 is a deficient number, since it is larger than the sum of its proper divisors (587905102179).

1220202112221 is a wasteful number, since it uses less digits than its factorization.

1220202112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10009545 (or 10009539 counting only the distinct ones).

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

Adding to 1220202112221 its reverse (1222112020221), we get a palindrome (2442314132442).

The spelling of 1220202112221 in words is "one trillion, two hundred twenty billion, two hundred two million, one hundred twelve thousand, two hundred twenty-one".