161472522221 has 2 divisors, whose sum is σ = 161472522222. Its totient is φ = 161472522220.

The previous prime is 161472522217. The next prime is 161472522317. The reversal of 161472522221 is 122225274161.

161472522221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90989706025 + 70482816196 = 301645^2 + 265486^2 .

It is an emirp because it is prime and its reverse (122225274161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161472522221 - 2² = 161472522217 is a prime.

It is a super-2 number, since 2×161472522221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161472522821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80736261110 + 80736261111.

It is an arithmetic number, because the mean of its divisors is an integer number (80736261111).

Almost surely, 2^161472522221 is an apocalyptic number.

It is an amenable number.

161472522221 is a deficient number, since it is larger than the sum of its proper divisors (1).

161472522221 is an equidigital number, since it uses as much as digits as its factorization.

161472522221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

Adding to 161472522221 its reverse (122225274161), we get a palindrome (283697796382).

The spelling of 161472522221 in words is "one hundred sixty-one billion, four hundred seventy-two million, five hundred twenty-two thousand, two hundred twenty-one".