30221311957 has 2 divisors, whose sum is σ = 30221311958. Its totient is φ = 30221311956.

The previous prime is 30221311943. The next prime is 30221312027. The reversal of 30221311957 is 75911312203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30123420721 + 97891236 = 173561^2 + 9894^2 .

It is an emirp because it is prime and its reverse (75911312203) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30221311957 is a prime.

It is a super-2 number, since 2×30221311957² (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 (30221311907) 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, 15110655978 + 15110655979.

It is an arithmetic number, because the mean of its divisors is an integer number (15110655979).

Almost surely, 2^30221311957 is an apocalyptic number.

It is an amenable number.

30221311957 is a deficient number, since it is larger than the sum of its proper divisors (1).

30221311957 is an equidigital number, since it uses as much as digits as its factorization.

30221311957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 34.

The spelling of 30221311957 in words is "thirty billion, two hundred twenty-one million, three hundred eleven thousand, nine hundred fifty-seven".