13162221 has 12 divisors (see below), whose sum is σ = 19209372. Its totient is φ = 8683776.

The previous prime is 13162211. The next prime is 13162241. The reversal of 13162221 is 12226131.

It can be written as a sum of positive squares in 2 ways, for example, as 2528100 + 10634121 = 1590^2 + 3261^2 .

It is not a de Polignac number, because 13162221 - 2¹⁸ = 12900077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13162194 and 13162203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13162211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6666 + ... + 8411.

It is an arithmetic number, because the mean of its divisors is an integer number (1600781).

Almost surely, 2^13162221 is an apocalyptic number.

It is an amenable number.

13162221 is a deficient number, since it is larger than the sum of its proper divisors (6047151).

13162221 is a wasteful number, since it uses less digits than its factorization.

13162221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15180 (or 15177 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 13162221 is about 3627.9775357629. The cubic root of 13162221 is about 236.1074692474.

Adding to 13162221 its reverse (12226131), we get a palindrome (25388352).

The spelling of 13162221 in words is "thirteen million, one hundred sixty-two thousand, two hundred twenty-one".