30131232012221 has 2 divisors, whose sum is σ = 30131232012222. Its totient is φ = 30131232012220.

The previous prime is 30131232012139. The next prime is 30131232012239. The reversal of 30131232012221 is 12221023213103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25291293612025 + 4839938400196 = 5029045^2 + 2199986^2 .

It is an emirp because it is prime and its reverse (12221023213103) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30131232012221 is a prime.

It is a super-2 number, since 2×30131232012221² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30131232012241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15065616006110 + 15065616006111.

It is an arithmetic number, because the mean of its divisors is an integer number (15065616006111).

Almost surely, 2^{30131232012221} is an apocalyptic number.

It is an amenable number.

30131232012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30131232012221 is an equidigital number, since it uses as much as digits as its factorization.

30131232012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 30131232012221 its reverse (12221023213103), we get a palindrome (42352255225324).

The spelling of 30131232012221 in words is "thirty trillion, one hundred thirty-one billion, two hundred thirty-two million, twelve thousand, two hundred twenty-one".