3421517221 has 2 divisors, whose sum is σ = 3421517222. Its totient is φ = 3421517220.

The previous prime is 3421517161. The next prime is 3421517249. The reversal of 3421517221 is 1227151243.

It is an a-pointer prime, because the next prime (3421517249) can be obtained adding 3421517221 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2314956996 + 1106560225 = 48114^2 + 33265^2 .

It is a cyclic number.

It is not a de Polignac number, because 3421517221 - 2¹¹ = 3421515173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3421517221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3421511221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1710758610 + 1710758611.

It is an arithmetic number, because the mean of its divisors is an integer number (1710758611).

Almost surely, 2^3421517221 is an apocalyptic number.

It is an amenable number.

3421517221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3421517221 is an equidigital number, since it uses as much as digits as its factorization.

3421517221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 3421517221 is about 58493.7365963229. The cubic root of 3421517221 is about 1506.8600190801.

Adding to 3421517221 its reverse (1227151243), we get a palindrome (4648668464).

The spelling of 3421517221 in words is "three billion, four hundred twenty-one million, five hundred seventeen thousand, two hundred twenty-one".