36231221 has 4 divisors (see below), whose sum is σ = 39018252. Its totient is φ = 33444192.

The previous prime is 36231197. The next prime is 36231227. The reversal of 36231221 is 12213263.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12213263 = 29 ⋅421147.

It can be written as a sum of positive squares in 2 ways, for example, as 16080100 + 20151121 = 4010^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 36231221 - 2¹⁰ = 36230197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 36231193 and 36231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36231227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393496 + ... + 1393521.

It is an arithmetic number, because the mean of its divisors is an integer number (9754563).

Almost surely, 2^36231221 is an apocalyptic number.

It is an amenable number.

36231221 is a deficient number, since it is larger than the sum of its proper divisors (2787031).

36231221 is a wasteful number, since it uses less digits than its factorization.

36231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787030.

The product of its digits is 432, while the sum is 20.

The square root of 36231221 is about 6019.2375763048. The cubic root of 36231221 is about 330.8981380169.

Adding to 36231221 its reverse (12213263), we get a palindrome (48444484).

The spelling of 36231221 in words is "thirty-six million, two hundred thirty-one thousand, two hundred twenty-one".