33490821 has 32 divisors (see below), whose sum is σ = 55810048. Its totient is φ = 17392320.

The previous prime is 33490817. The next prime is 33490841. The reversal of 33490821 is 12809433.

It is not a de Polignac number, because 33490821 - 2² = 33490817 is a prime.

It is a super-2 number, since 2×33490821² = 2243270182508082, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33490801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17376 + ... + 19206.

It is an arithmetic number, because the mean of its divisors is an integer number (1744064).

Almost surely, 2^33490821 is an apocalyptic number.

It is an amenable number.

33490821 is a deficient number, since it is larger than the sum of its proper divisors (22319227).

33490821 is a wasteful number, since it uses less digits than its factorization.

33490821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 33490821 is about 5787.1254522431. The cubic root of 33490821 is about 322.3358409777.

The spelling of 33490821 in words is "thirty-three million, four hundred ninety thousand, eight hundred twenty-one".