30331311221 has 2 divisors, whose sum is σ = 30331311222. Its totient is φ = 30331311220.

The previous prime is 30331311193. The next prime is 30331311247. The reversal of 30331311221 is 12211313303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30295143025 + 36168196 = 174055^2 + 6014^2 .

It is a cyclic number.

It is not a de Polignac number, because 30331311221 - 2¹⁰ = 30331310197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30331311193 and 30331311202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30331311251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15165655610 + 15165655611.

It is an arithmetic number, because the mean of its divisors is an integer number (15165655611).

Almost surely, 2^30331311221 is an apocalyptic number.

It is an amenable number.

30331311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30331311221 is an equidigital number, since it uses as much as digits as its factorization.

30331311221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 30331311221 its reverse (12211313303), we get a palindrome (42542624524).

The spelling of 30331311221 in words is "thirty billion, three hundred thirty-one million, three hundred eleven thousand, two hundred twenty-one".