33684021 has 36 divisors (see below), whose sum is σ = 59940972. Its totient is φ = 18111744.

The previous prime is 33684019. The next prime is 33684037. The reversal of 33684021 is 12048633.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31203396 + 2480625 = 5586^2 + 1575^2 .

It is not a de Polignac number, because 33684021 - 2¹ = 33684019 is a prime.

It is a super-2 number, since 2×33684021² = 2269226541456882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33684061) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5251 + ... + 9743.

It is an arithmetic number, because the mean of its divisors is an integer number (1665027).

Almost surely, 2^33684021 is an apocalyptic number.

It is an amenable number.

33684021 is a deficient number, since it is larger than the sum of its proper divisors (26256951).

33684021 is a wasteful number, since it uses less digits than its factorization.

33684021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4530 (or 4520 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 33684021 is about 5803.7936731073. The cubic root of 33684021 is about 322.9544773170.

The spelling of 33684021 in words is "thirty-three million, six hundred eighty-four thousand, twenty-one".