30121313332181 has 2 divisors, whose sum is σ = 30121313332182. Its totient is φ = 30121313332180.

The previous prime is 30121313332169. The next prime is 30121313332261. The reversal of 30121313332181 is 18123331312103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28125690929956 + 1995622402225 = 5303366^2 + 1412665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30121313332181 is a prime.

It is a super-2 number, since 2×30121313332181² (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 (30121313332111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060656666090 + 15060656666091.

It is an arithmetic number, because the mean of its divisors is an integer number (15060656666091).

Almost surely, 2^{30121313332181} is an apocalyptic number.

It is an amenable number.

30121313332181 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121313332181 is an equidigital number, since it uses as much as digits as its factorization.

30121313332181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

Adding to 30121313332181 its reverse (18123331312103), we get a palindrome (48244644644284).

The spelling of 30121313332181 in words is "thirty trillion, one hundred twenty-one billion, three hundred thirteen million, three hundred thirty-two thousand, one hundred eighty-one".