33021213 has 8 divisors (see below), whose sum is σ = 44965248. Its totient is φ = 21545664.

The previous prime is 33021211. The next prime is 33021217. The reversal of 33021213 is 31212033.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 33021213 - 2¹ = 33021211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33021192 and 33021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33021211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116956 + ... + 117237.

It is an arithmetic number, because the mean of its divisors is an integer number (5620656).

Almost surely, 2^33021213 is an apocalyptic number.

It is an amenable number.

33021213 is a deficient number, since it is larger than the sum of its proper divisors (11944035).

33021213 is a wasteful number, since it uses less digits than its factorization.

33021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234243.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 33021213 is about 5746.4087045737. The cubic root of 33021213 is about 320.8221469910.

Adding to 33021213 its reverse (31212033), we get a palindrome (64233246).

The spelling of 33021213 in words is "thirty-three million, twenty-one thousand, two hundred thirteen".