1220211022221 has 16 divisors (see below), whose sum is σ = 1846182163200. Its totient is φ = 796166056224.

The previous prime is 1220211022213. The next prime is 1220211022223. The reversal of 1220211022221 is 1222201120221.

It is a happy number.

It is not a de Polignac number, because 1220211022221 - 2³ = 1220211022213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220211022194 and 1220211022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220211022223) 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, 480775336 + ... + 480777873.

It is an arithmetic number, because the mean of its divisors is an integer number (115386385200).

Almost surely, 2^{1220211022221} is an apocalyptic number.

It is an amenable number.

1220211022221 is a deficient number, since it is larger than the sum of its proper divisors (625971140979).

1220211022221 is an equidigital number, since it uses as much as digits as its factorization.

1220211022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961553265 (or 961553259 counting only the distinct ones).

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

Adding to 1220211022221 its reverse (1222201120221), we get a palindrome (2442412142442).

The spelling of 1220211022221 in words is "one trillion, two hundred twenty billion, two hundred eleven million, twenty-two thousand, two hundred twenty-one".