33212021 has 4 divisors (see below), whose sum is σ = 33404172. Its totient is φ = 33019872.

The previous prime is 33211993. The next prime is 33212029. The reversal of 33212021 is 12021233.

It is a happy number.

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 20884900 + 12327121 = 4570^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 33212021 - 2⁶ = 33211957 is a prime.

It is a super-2 number, since 2×33212021² = 2206076677808882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33211987 and 33212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33212029) 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, 95816 + ... + 96161.

It is an arithmetic number, because the mean of its divisors is an integer number (8351043).

Almost surely, 2^33212021 is an apocalyptic number.

It is an amenable number.

33212021 is a deficient number, since it is larger than the sum of its proper divisors (192151).

33212021 is a wasteful number, since it uses less digits than its factorization.

33212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192150.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 33212021 is about 5762.9871594513. The cubic root of 33212021 is about 321.4389010484.

Adding to 33212021 its reverse (12021233), we get a palindrome (45233254).

The spelling of 33212021 in words is "thirty-three million, two hundred twelve thousand, twenty-one".