33213021 has 8 divisors (see below), whose sum is σ = 44323680. Its totient is φ = 22122192.

The previous prime is 33213017. The next prime is 33213049. The reversal of 33213021 is 12031233.

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

It is not a de Polignac number, because 33213021 - 2² = 33213017 is a prime.

It is a super-2 number, since 2×33213021² = 2206209527892882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33211021) 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, 466 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (5540460).

Almost surely, 2^33213021 is an apocalyptic number.

It is an amenable number.

33213021 is a deficient number, since it is larger than the sum of its proper divisors (11110659).

33213021 is a wasteful number, since it uses less digits than its factorization.

33213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9915.

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

The square root of 33213021 is about 5763.0739193594. The cubic root of 33213021 is about 321.4421271461.

Adding to 33213021 its reverse (12031233), we get a palindrome (45244254).

The spelling of 33213021 in words is "thirty-three million, two hundred thirteen thousand, twenty-one".