236148221 has 2 divisors, whose sum is σ = 236148222. Its totient is φ = 236148220.

The previous prime is 236148181. The next prime is 236148229. The reversal of 236148221 is 122841632.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138415225 + 97732996 = 11765^2 + 9886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-236148221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (236148229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118074110 + 118074111.

It is an arithmetic number, because the mean of its divisors is an integer number (118074111).

Almost surely, 2^236148221 is an apocalyptic number.

It is an amenable number.

236148221 is a deficient number, since it is larger than the sum of its proper divisors (1).

236148221 is an equidigital number, since it uses as much as digits as its factorization.

236148221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 29.

The square root of 236148221 is about 15367.1149211555. The cubic root of 236148221 is about 618.1040075539.

Adding to 236148221 its reverse (122841632), we get a palindrome (358989853).

The spelling of 236148221 in words is "two hundred thirty-six million, one hundred forty-eight thousand, two hundred twenty-one".