30000421991 has 2 divisors, whose sum is σ = 30000421992. Its totient is φ = 30000421990.

The previous prime is 30000421967. The next prime is 30000422003. The reversal of 30000421991 is 19912400003.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19912400003) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30000421991 - 2³⁴ = 12820552807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30000421921) 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, 15000210995 + 15000210996.

It is an arithmetic number, because the mean of its divisors is an integer number (15000210996).

Almost surely, 2^30000421991 is an apocalyptic number.

30000421991 is a deficient number, since it is larger than the sum of its proper divisors (1).

30000421991 is an equidigital number, since it uses as much as digits as its factorization.

30000421991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

Adding to 30000421991 its reverse (19912400003), we get a palindrome (49912821994).

The spelling of 30000421991 in words is "thirty billion, four hundred twenty-one thousand, nine hundred ninety-one".