220021116221 has 2 divisors, whose sum is σ = 220021116222. Its totient is φ = 220021116220.

The previous prime is 220021116209. The next prime is 220021116229. The reversal of 220021116221 is 122611120022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169858555321 + 50162560900 = 412139^2 + 223970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220021116221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220021116193 and 220021116202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220021116229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110010558110 + 110010558111.

It is an arithmetic number, because the mean of its divisors is an integer number (110010558111).

Almost surely, 2^220021116221 is an apocalyptic number.

It is an amenable number.

220021116221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220021116221 is an equidigital number, since it uses as much as digits as its factorization.

220021116221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 220021116221 its reverse (122611120022), we get a palindrome (342632236243).

The spelling of 220021116221 in words is "two hundred twenty billion, twenty-one million, one hundred sixteen thousand, two hundred twenty-one".