33540021 has 16 divisors (see below), whose sum is σ = 50000320. Its totient is φ = 22219920.

The previous prime is 33540011. The next prime is 33540053. The reversal of 33540021 is 12004533.

It is not a de Polignac number, because 33540021 - 2⁷ = 33539893 is a prime.

It is a super-2 number, since 2×33540021² = 2249866017360882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33539976 and 33540003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33540011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 591 + ... + 8211.

It is an arithmetic number, because the mean of its divisors is an integer number (3125020).

Almost surely, 2^33540021 is an apocalyptic number.

It is an amenable number.

33540021 is a deficient number, since it is larger than the sum of its proper divisors (16460299).

33540021 is a wasteful number, since it uses less digits than its factorization.

33540021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7793 (or 7787 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 33540021 is about 5791.3747072694. The cubic root of 33540021 is about 322.4936072286.

Adding to 33540021 its reverse (12004533), we get a palindrome (45544554).

The spelling of 33540021 in words is "thirty-three million, five hundred forty thousand, twenty-one".