33221313221 has 4 divisors (see below), whose sum is σ = 33225688032. Its totient is φ = 33216938412.

The previous prime is 33221313157. The next prime is 33221313331. The reversal of 33221313221 is 12231312233.

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 33221313221 - 2⁶ = 33221313157 is a prime.

It is a super-2 number, since 2×33221313221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33221313121) 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, 2175995 + ... + 2191208.

It is an arithmetic number, because the mean of its divisors is an integer number (8306422008).

Almost surely, 2^33221313221 is an apocalyptic number.

It is an amenable number.

33221313221 is a deficient number, since it is larger than the sum of its proper divisors (4374811).

33221313221 is an equidigital number, since it uses as much as digits as its factorization.

33221313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4374810.

The product of its digits is 1296, while the sum is 23.

Adding to 33221313221 its reverse (12231312233), we get a palindrome (45452625454).

The spelling of 33221313221 in words is "thirty-three billion, two hundred twenty-one million, three hundred thirteen thousand, two hundred twenty-one".