30390492721 has 2 divisors, whose sum is σ = 30390492722. Its totient is φ = 30390492720.

The previous prime is 30390492707. The next prime is 30390492767. The reversal of 30390492721 is 12729409303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18099666225 + 12290826496 = 134535^2 + 110864^2 .

It is a cyclic number.

It is not a de Polignac number, because 30390492721 - 2³¹ = 28243009073 is a prime.

It is not a weakly prime, because it can be changed into another prime (30390492701) 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, 15195246360 + 15195246361.

It is an arithmetic number, because the mean of its divisors is an integer number (15195246361).

Almost surely, 2^30390492721 is an apocalyptic number.

It is an amenable number.

30390492721 is a deficient number, since it is larger than the sum of its proper divisors (1).

30390492721 is an equidigital number, since it uses as much as digits as its factorization.

30390492721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 30390492721 in words is "thirty billion, three hundred ninety million, four hundred ninety-two thousand, seven hundred twenty-one".