30121280381 has 2 divisors, whose sum is σ = 30121280382. Its totient is φ = 30121280380.

The previous prime is 30121280377. The next prime is 30121280407. The reversal of 30121280381 is 18308212103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15803004100 + 14318276281 = 125710^2 + 119659^2 .

It is an emirp because it is prime and its reverse (18308212103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30121280381 - 2² = 30121280377 is a prime.

It is a super-2 number, since 2×30121280381² (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 (30121280281) 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, 15060640190 + 15060640191.

It is an arithmetic number, because the mean of its divisors is an integer number (15060640191).

Almost surely, 2^30121280381 is an apocalyptic number.

It is an amenable number.

30121280381 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121280381 is an equidigital number, since it uses as much as digits as its factorization.

30121280381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

Adding to 30121280381 its reverse (18308212103), we get a palindrome (48429492484).

The spelling of 30121280381 in words is "thirty billion, one hundred twenty-one million, two hundred eighty thousand, three hundred eighty-one".