33930821 has 4 divisors (see below), whose sum is σ = 34758444. Its totient is φ = 33103200.

The previous prime is 33930811. The next prime is 33930847. The reversal of 33930821 is 12803933.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1600225 + 32330596 = 1265^2 + 5686^2 .

It is a cyclic number.

It is not a de Polignac number, because 33930821 - 2²² = 29736517 is a prime.

It is a super-2 number, since 2×33930821² = 2302601227468082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33930811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413750 + ... + 413831.

It is an arithmetic number, because the mean of its divisors is an integer number (8689611).

Almost surely, 2^33930821 is an apocalyptic number.

It is an amenable number.

33930821 is a deficient number, since it is larger than the sum of its proper divisors (827623).

33930821 is an equidigital number, since it uses as much as digits as its factorization.

33930821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827622.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 33930821 is about 5825.0168240100. The cubic root of 33930821 is about 323.7413122100.

The spelling of 33930821 in words is "thirty-three million, nine hundred thirty thousand, eight hundred twenty-one".