30000320021 has 6 divisors (see below), whose sum is σ = 34898331510. Its totient is φ = 25714559976.

The previous prime is 30000320017. The next prime is 30000320027. The reversal of 30000320021 is 12002300003.

It can be written as a sum of positive squares in only one way, i.e., 29136783025 + 863536996 = 170695^2 + 29386^2 .

It is not a de Polignac number, because 30000320021 - 2² = 30000320017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30000319984 and 30000320011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000320027) 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 in 5 ways as a sum of consecutive naturals, for example, 306125666 + ... + 306125763.

It is an arithmetic number, because the mean of its divisors is an integer number (5816388585).

Almost surely, 2^30000320021 is an apocalyptic number.

It is an amenable number.

30000320021 is a deficient number, since it is larger than the sum of its proper divisors (4898011489).

30000320021 is an equidigital number, since it uses as much as digits as its factorization.

30000320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612251443 (or 612251436 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

Adding to 30000320021 its reverse (12002300003), we get a palindrome (42002620024).

The spelling of 30000320021 in words is "thirty billion, three hundred twenty thousand, twenty-one".