30251447221 has 2 divisors, whose sum is σ = 30251447222. Its totient is φ = 30251447220.

The previous prime is 30251447209. The next prime is 30251447267. The reversal of 30251447221 is 12274415203.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20148383025 + 10103064196 = 141945^2 + 100514^2 .

It is a cyclic number.

It is not a de Polignac number, because 30251447221 - 2²¹ = 30249350069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30231447221) 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, 15125723610 + 15125723611.

It is an arithmetic number, because the mean of its divisors is an integer number (15125723611).

Almost surely, 2^30251447221 is an apocalyptic number.

It is an amenable number.

30251447221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30251447221 is an equidigital number, since it uses as much as digits as its factorization.

30251447221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

The spelling of 30251447221 in words is "thirty billion, two hundred fifty-one million, four hundred forty-seven thousand, two hundred twenty-one".