33213211021 has 4 divisors (see below), whose sum is σ = 33217998912. Its totient is φ = 33208423132.

The previous prime is 33213210949. The next prime is 33213211063. The reversal of 33213211021 is 12011231233.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33213211021 - 2²¹ = 33211113869 is a prime.

It is a super-2 number, since 2×33213211021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33213211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33213211081) 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, 2383525 + ... + 2397418.

It is an arithmetic number, because the mean of its divisors is an integer number (8304499728).

Almost surely, 2^33213211021 is an apocalyptic number.

It is an amenable number.

33213211021 is a deficient number, since it is larger than the sum of its proper divisors (4787891).

33213211021 is an equidigital number, since it uses as much as digits as its factorization.

33213211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4787890.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 33213211021 its reverse (12011231233), we get a palindrome (45224442254).

The spelling of 33213211021 in words is "thirty-three billion, two hundred thirteen million, two hundred eleven thousand, twenty-one".