33136821 has 12 divisors (see below), whose sum is σ = 49515180. Its totient is φ = 21329280.

The previous prime is 33136811. The next prime is 33136841. The reversal of 33136821 is 12863133.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27562500 + 5574321 = 5250^2 + 2361^2 .

It is not a de Polignac number, because 33136821 - 2⁹ = 33136309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33136801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63220 + ... + 63741.

It is an arithmetic number, because the mean of its divisors is an integer number (4126265).

Almost surely, 2^33136821 is an apocalyptic number.

It is an amenable number.

33136821 is a deficient number, since it is larger than the sum of its proper divisors (16378359).

33136821 is a wasteful number, since it uses less digits than its factorization.

33136821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126996 (or 126993 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 33136821 is about 5756.4590678645. The cubic root of 33136821 is about 321.1961127295.

Adding to 33136821 its reverse (12863133), we get a palindrome (45999954).

The spelling of 33136821 in words is "thirty-three million, one hundred thirty-six thousand, eight hundred twenty-one".