33855021 has 6 divisors (see below), whose sum is σ = 48901710. Its totient is φ = 22570008.

The previous prime is 33855013. The next prime is 33855077. The reversal of 33855021 is 12055833.

It can be written as a sum of positive squares in only one way, i.e., 32832900 + 1022121 = 5730^2 + 1011^2 .

It is not a de Polignac number, because 33855021 - 2³ = 33855013 is a prime.

It is a super-2 number, since 2×33855021² = 2292324893820882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33855821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1880826 + ... + 1880843.

It is an arithmetic number, because the mean of its divisors is an integer number (8150285).

Almost surely, 2^33855021 is an apocalyptic number.

It is an amenable number.

33855021 is a deficient number, since it is larger than the sum of its proper divisors (15046689).

33855021 is a wasteful number, since it uses less digits than its factorization.

33855021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761675 (or 3761672 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 33855021 is about 5818.5067672041. The cubic root of 33855021 is about 323.5000577309.

The spelling of 33855021 in words is "thirty-three million, eight hundred fifty-five thousand, twenty-one".