163415221 has 4 divisors (see below), whose sum is σ = 165100012. Its totient is φ = 161730432.

The previous prime is 163415201. The next prime is 163415227. The reversal of 163415221 is 122514361.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93508900 + 69906321 = 9670^2 + 8361^2 .

It is a cyclic number.

It is not a de Polignac number, because 163415221 - 2¹³ = 163407029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163415227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842250 + ... + 842443.

It is an arithmetic number, because the mean of its divisors is an integer number (41275003).

Almost surely, 2^163415221 is an apocalyptic number.

It is an amenable number.

163415221 is a deficient number, since it is larger than the sum of its proper divisors (1684791).

163415221 is an equidigital number, since it uses as much as digits as its factorization.

163415221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684790.

The product of its digits is 1440, while the sum is 25.

The square root of 163415221 is about 12783.3963014529. The cubic root of 163415221 is about 546.7190018224.

Adding to 163415221 its reverse (122514361), we get a palindrome (285929582).

The spelling of 163415221 in words is "one hundred sixty-three million, four hundred fifteen thousand, two hundred twenty-one".