221201137 has 2 divisors, whose sum is σ = 221201138. Its totient is φ = 221201136.

The previous prime is 221201131. The next prime is 221201153. The reversal of 221201137 is 731102122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116834481 + 104366656 = 10809^2 + 10216^2 .

It is a cyclic number.

It is not a de Polignac number, because 221201137 - 2²⁷ = 86983409 is a prime.

It is not a weakly prime, because it can be changed into another prime (221201131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600568 + 110600569.

It is an arithmetic number, because the mean of its divisors is an integer number (110600569).

Almost surely, 2^221201137 is an apocalyptic number.

It is an amenable number.

221201137 is a deficient number, since it is larger than the sum of its proper divisors (1).

221201137 is an equidigital number, since it uses as much as digits as its factorization.

221201137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 221201137 is about 14872.8321781697. The cubic root of 221201137 is about 604.7777222289. Note that the first 4 decimals are identical.

Adding to 221201137 its reverse (731102122), we get a palindrome (952303259).

The spelling of 221201137 in words is "two hundred twenty-one million, two hundred one thousand, one hundred thirty-seven".