30721273481 has 2 divisors, whose sum is σ = 30721273482. Its totient is φ = 30721273480.

The previous prime is 30721273477. The next prime is 30721273507. The reversal of 30721273481 is 18437212703.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30665263225 + 56010256 = 175115^2 + 7484^2 .

It is a cyclic number.

It is not a de Polignac number, because 30721273481 - 2² = 30721273477 is a prime.

It is a super-2 number, since 2×30721273481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30721273181) 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, 15360636740 + 15360636741.

It is an arithmetic number, because the mean of its divisors is an integer number (15360636741).

Almost surely, 2^30721273481 is an apocalyptic number.

It is an amenable number.

30721273481 is a deficient number, since it is larger than the sum of its proper divisors (1).

30721273481 is an equidigital number, since it uses as much as digits as its factorization.

30721273481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 30721273481 in words is "thirty billion, seven hundred twenty-one million, two hundred seventy-three thousand, four hundred eighty-one".