33212121 has 16 divisors (see below), whose sum is σ = 45497088. Its totient is φ = 21542400.

The previous prime is 33212119. The next prime is 33212131. The reversal of 33212121 is 12121233.

It is not a de Polignac number, because 33212121 - 2¹ = 33212119 is a prime.

It is a super-3 number, since 3×33212121³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 33212121.

It is not an unprimeable number, because it can be changed into a prime (33212111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16816 + ... + 18686.

It is an arithmetic number, because the mean of its divisors is an integer number (2843568).

Almost surely, 2^33212121 is an apocalyptic number.

It is an amenable number.

33212121 is a deficient number, since it is larger than the sum of its proper divisors (12284967).

33212121 is a wasteful number, since it uses less digits than its factorization.

33212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032.

The product of its digits is 72, while the sum is 15.

The square root of 33212121 is about 5762.9958355008. The cubic root of 33212121 is about 321.4392236611.

Adding to 33212121 its reverse (12121233), we get a palindrome (45333354).

It can be divided in two parts, 33212 and 121, that added together give a palindrome (33333).

The spelling of 33212121 in words is "thirty-three million, two hundred twelve thousand, one hundred twenty-one".