33706021 has 4 divisors (see below), whose sum is σ = 34793344. Its totient is φ = 32618700.

The previous prime is 33706009. The next prime is 33706073. The reversal of 33706021 is 12060733.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12060733 = 53 ⋅227561.

It is a cyclic number.

It is not a de Polignac number, because 33706021 - 2¹¹ = 33703973 is a prime.

It is a super-2 number, since 2×33706021² = 2272191703304882, 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 = 33705983 and 33706001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33706081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543615 + ... + 543676.

It is an arithmetic number, because the mean of its divisors is an integer number (8698336).

Almost surely, 2^33706021 is an apocalyptic number.

33706021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

33706021 is a deficient number, since it is larger than the sum of its proper divisors (1087323).

33706021 is a wasteful number, since it uses less digits than its factorization.

33706021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087322.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 33706021 is about 5805.6886757731. The cubic root of 33706021 is about 323.0247722920.

Adding to 33706021 its reverse (12060733), we get a palindrome (45766754).

The spelling of 33706021 in words is "thirty-three million, seven hundred six thousand, twenty-one".