1220221120221 has 64 divisors (see below), whose sum is σ = 1839511296000. Its totient is φ = 799322256000.

The previous prime is 1220221120219. The next prime is 1220221120243. The reversal of 1220221120221 is 1220211220221.

It is a happy number.

1220221120221 is a `hidden beast` number, since 1 + 220 + 221 + 1 + 2 + 0 + 221 = 666.

It is not a de Polignac number, because 1220221120221 - 2¹ = 1220221120219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220221120194 and 1220221120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221120211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 353788105 + ... + 353791553.

It is an arithmetic number, because the mean of its divisors is an integer number (28742364000).

Almost surely, 2^{1220221120221} is an apocalyptic number.

It is an amenable number.

1220221120221 is a deficient number, since it is larger than the sum of its proper divisors (619290175779).

1220221120221 is a wasteful number, since it uses less digits than its factorization.

1220221120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527 (or 4521 counting only the distinct ones).

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

Adding to 1220221120221 its reverse (1220211220221), we get a palindrome (2440432340442).

The spelling of 1220221120221 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".