33431303221 has 2 divisors, whose sum is σ = 33431303222. Its totient is φ = 33431303220.

The previous prime is 33431303197. The next prime is 33431303231. The reversal of 33431303221 is 12230313433.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33348238225 + 83064996 = 182615^2 + 9114^2 .

It is a cyclic number.

It is not a de Polignac number, because 33431303221 - 2⁵ = 33431303189 is a prime.

It is a super-2 number, since 2×33431303221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33431303231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16715651610 + 16715651611.

It is an arithmetic number, because the mean of its divisors is an integer number (16715651611).

Almost surely, 2^33431303221 is an apocalyptic number.

It is an amenable number.

33431303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33431303221 is an equidigital number, since it uses as much as digits as its factorization.

33431303221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 33431303221 its reverse (12230313433), we get a palindrome (45661616654).

It can be divided in two parts, 33431303 and 221, that added together give a square (33431524 = 5782²).

The spelling of 33431303221 in words is "thirty-three billion, four hundred thirty-one million, three hundred three thousand, two hundred twenty-one".