30301731721 has 2 divisors, whose sum is σ = 30301731722. Its totient is φ = 30301731720.

The previous prime is 30301731673. The next prime is 30301731737. The reversal of 30301731721 is 12713710303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17486359696 + 12815372025 = 132236^2 + 113205^2 .

It is a cyclic number.

It is not a de Polignac number, because 30301731721 - 2²⁷ = 30167513993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30301731721.

It is not a weakly prime, because it can be changed into another prime (30301737721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15150865860 + 15150865861.

It is an arithmetic number, because the mean of its divisors is an integer number (15150865861).

Almost surely, 2^30301731721 is an apocalyptic number.

It is an amenable number.

30301731721 is a deficient number, since it is larger than the sum of its proper divisors (1).

30301731721 is an equidigital number, since it uses as much as digits as its factorization.

30301731721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646, while the sum is 28.

The spelling of 30301731721 in words is "thirty billion, three hundred one million, seven hundred thirty-one thousand, seven hundred twenty-one".