221201135 has 16 divisors (see below), whose sum is σ = 279797760. Its totient is φ = 167415840.

The previous prime is 221201131. The next prime is 221201137. The reversal of 221201135 is 531102122.

It is a happy number.

It is not a de Polignac number, because 221201135 - 2² = 221201131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201131) 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 in 15 ways as a sum of consecutive naturals, for example, 103730 + ... + 105840.

It is an arithmetic number, because the mean of its divisors is an integer number (17487360).

Almost surely, 2^221201135 is an apocalyptic number.

221201135 is a deficient number, since it is larger than the sum of its proper divisors (58596625).

221201135 is a wasteful number, since it uses less digits than its factorization.

221201135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 221201135 is about 14872.8321109330. The cubic root of 221201135 is about 604.7777204062. Note that the first 4 decimals are identical.

Adding to 221201135 its reverse (531102122), we get a palindrome (752303257).

The spelling of 221201135 in words is "two hundred twenty-one million, two hundred one thousand, one hundred thirty-five".