33113231221 has 6 divisors (see below), whose sum is σ = 38519473110. Its totient is φ = 28382769576.

The previous prime is 33113231189. The next prime is 33113231233. The reversal of 33113231221 is 12213231133.

It can be written as a sum of positive squares in only one way, i.e., 18948899025 + 14164332196 = 137655^2 + 119014^2 .

It is not a de Polignac number, because 33113231221 - 2⁵ = 33113231189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33113231192 and 33113231201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33113231251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 337890066 + ... + 337890163.

It is an arithmetic number, because the mean of its divisors is an integer number (6419912185).

Almost surely, 2^33113231221 is an apocalyptic number.

It is an amenable number.

33113231221 is a deficient number, since it is larger than the sum of its proper divisors (5406241889).

33113231221 is an equidigital number, since it uses as much as digits as its factorization.

33113231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675780243 (or 675780236 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

Adding to 33113231221 its reverse (12213231133), we get a palindrome (45326462354).

The spelling of 33113231221 in words is "thirty-three billion, one hundred thirteen million, two hundred thirty-one thousand, two hundred twenty-one".