30409982821 has 2 divisors, whose sum is σ = 30409982822. Its totient is φ = 30409982820.

The previous prime is 30409982803. The next prime is 30409982843. The reversal of 30409982821 is 12828990403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22293774721 + 8116208100 = 149311^2 + 90090^2 .

It is a cyclic number.

It is not a de Polignac number, because 30409982821 - 2¹⁷ = 30409851749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30409982221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15204991410 + 15204991411.

It is an arithmetic number, because the mean of its divisors is an integer number (15204991411).

Almost surely, 2^30409982821 is an apocalyptic number.

It is an amenable number.

30409982821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30409982821 is an equidigital number, since it uses as much as digits as its factorization.

30409982821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 30409982821 in words is "thirty billion, four hundred nine million, nine hundred eighty-two thousand, eight hundred twenty-one".