32118221 has 2 divisors, whose sum is σ = 32118222. Its totient is φ = 32118220.

The previous prime is 32118197. The next prime is 32118241. The reversal of 32118221 is 12281123.

It is an a-pointer prime, because the next prime (32118241) can be obtained adding 32118221 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25300900 + 6817321 = 5030^2 + 2611^2 .

It is a cyclic number.

It is not a de Polignac number, because 32118221 - 2⁶ = 32118157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 32118193 and 32118202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32118241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16059110 + 16059111.

It is an arithmetic number, because the mean of its divisors is an integer number (16059111).

Almost surely, 2^32118221 is an apocalyptic number.

It is an amenable number.

32118221 is a deficient number, since it is larger than the sum of its proper divisors (1).

32118221 is an equidigital number, since it uses as much as digits as its factorization.

32118221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

The square root of 32118221 is about 5667.2939750819. The cubic root of 32118221 is about 317.8706968736.

Adding to 32118221 its reverse (12281123), we get a palindrome (44399344).

The spelling of 32118221 in words is "thirty-two million, one hundred eighteen thousand, two hundred twenty-one".