36331221 has 4 divisors (see below), whose sum is σ = 48441632. Its totient is φ = 24220812.

The previous prime is 36331189. The next prime is 36331223. The reversal of 36331221 is 12213363.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 36331221 - 2⁵ = 36331189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36331223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6055201 + ... + 6055206.

It is an arithmetic number, because the mean of its divisors is an integer number (12110408).

Almost surely, 2^36331221 is an apocalyptic number.

It is an amenable number.

36331221 is a deficient number, since it is larger than the sum of its proper divisors (12110411).

36331221 is a wasteful number, since it uses less digits than its factorization.

36331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12110410.

The product of its digits is 648, while the sum is 21.

The square root of 36331221 is about 6027.5385523446. The cubic root of 36331221 is about 331.2022902214.

Adding to 36331221 its reverse (12213363), we get a palindrome (48544584).

The spelling of 36331221 in words is "thirty-six million, three hundred thirty-one thousand, two hundred twenty-one".