33636121 has 4 divisors (see below), whose sum is σ = 33650100. Its totient is φ = 33622144.

The previous prime is 33636101. The next prime is 33636181. The reversal of 33636121 is 12163633.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12163633 = 1613 ⋅7541.

It can be written as a sum of positive squares in 2 ways, for example, as 14930496 + 18705625 = 3864^2 + 4325^2 .

It is a cyclic number.

It is not a de Polignac number, because 33636121 - 2⁷ = 33635993 is a prime.

It is a super-2 number, since 2×33636121² = 2262777271853282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33636101) 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, 2356 + ... + 8533.

It is an arithmetic number, because the mean of its divisors is an integer number (8412525).

Almost surely, 2^33636121 is an apocalyptic number.

It is an amenable number.

33636121 is a deficient number, since it is larger than the sum of its proper divisors (13979).

33636121 is a wasteful number, since it uses less digits than its factorization.

33636121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13978.

The product of its digits is 1944, while the sum is 25.

The square root of 33636121 is about 5799.6655938080. The cubic root of 33636121 is about 322.8013200478.

Adding to 33636121 its reverse (12163633), we get a palindrome (45799754).

The spelling of 33636121 in words is "thirty-three million, six hundred thirty-six thousand, one hundred twenty-one".