221628489169 has 2 divisors, whose sum is σ = 221628489170. Its totient is φ = 221628489168.

The previous prime is 221628489161. The next prime is 221628489211. The reversal of 221628489169 is 961984826122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189259801600 + 32368687569 = 435040^2 + 179913^2 .

It is a cyclic number.

It is not a de Polignac number, because 221628489169 - 2³ = 221628489161 is a prime.

It is a super-2 number, since 2×221628489169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221628489161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110814244584 + 110814244585.

It is an arithmetic number, because the mean of its divisors is an integer number (110814244585).

Almost surely, 2^221628489169 is an apocalyptic number.

It is an amenable number.

221628489169 is a deficient number, since it is larger than the sum of its proper divisors (1).

221628489169 is an equidigital number, since it uses as much as digits as its factorization.

221628489169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 58.

The spelling of 221628489169 in words is "two hundred twenty-one billion, six hundred twenty-eight million, four hundred eighty-nine thousand, one hundred sixty-nine".