33113221 has 2 divisors, whose sum is σ = 33113222. Its totient is φ = 33113220.

The previous prime is 33113207. The next prime is 33113231. The reversal of 33113221 is 12231133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31192225 + 1920996 = 5585^2 + 1386^2 .

It is an emirp because it is prime and its reverse (12231133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33113221 - 2⁵ = 33113189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33113195 and 33113204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33113231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16556610 + 16556611.

It is an arithmetic number, because the mean of its divisors is an integer number (16556611).

Almost surely, 2^33113221 is an apocalyptic number.

It is an amenable number.

33113221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33113221 is an equidigital number, since it uses as much as digits as its factorization.

33113221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 16.

The square root of 33113221 is about 5754.4088314961. The cubic root of 33113221 is about 321.1198428049.

Adding to 33113221 its reverse (12231133), we get a palindrome (45344354).

The spelling of 33113221 in words is "thirty-three million, one hundred thirteen thousand, two hundred twenty-one".