30012005021 has 2 divisors, whose sum is σ = 30012005022. Its totient is φ = 30012005020.

The previous prime is 30012005011. The next prime is 30012005057. The reversal of 30012005021 is 12050021003.

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., 26858620996 + 3153384025 = 163886^2 + 56155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30012005021 is a prime.

It is a super-3 number, since 3×30012005021³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30012004987 and 30012005005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30012005011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15006002510 + 15006002511.

It is an arithmetic number, because the mean of its divisors is an integer number (15006002511).

Almost surely, 2^30012005021 is an apocalyptic number.

It is an amenable number.

30012005021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30012005021 is an equidigital number, since it uses as much as digits as its factorization.

30012005021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 14.

Adding to 30012005021 its reverse (12050021003), we get a palindrome (42062026024).

The spelling of 30012005021 in words is "thirty billion, twelve million, five thousand, twenty-one".