16220141221 has 2 divisors, whose sum is σ = 16220141222. Its totient is φ = 16220141220.

The previous prime is 16220141183. The next prime is 16220141233. The reversal of 16220141221 is 12214102261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11553885121 + 4666256100 = 107489^2 + 68310^2 .

It is an emirp because it is prime and its reverse (12214102261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16220141221 - 2¹⁵ = 16220108453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16220141192 and 16220141201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16220121221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110070610 + 8110070611.

It is an arithmetic number, because the mean of its divisors is an integer number (8110070611).

Almost surely, 2^16220141221 is an apocalyptic number.

It is an amenable number.

16220141221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16220141221 is an equidigital number, since it uses as much as digits as its factorization.

16220141221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 16220141221 its reverse (12214102261), we get a palindrome (28434243482).

The spelling of 16220141221 in words is "sixteen billion, two hundred twenty million, one hundred forty-one thousand, two hundred twenty-one".