19300912121 has 2 divisors, whose sum is σ = 19300912122. Its totient is φ = 19300912120.

The previous prime is 19300912061. The next prime is 19300912129. The reversal of 19300912121 is 12121900391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18553436521 + 747475600 = 136211^2 + 27340^2 .

It is an emirp because it is prime and its reverse (12121900391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19300912121 is a prime.

It is not a weakly prime, because it can be changed into another prime (19300912129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9650456060 + 9650456061.

It is an arithmetic number, because the mean of its divisors is an integer number (9650456061).

Almost surely, 2^19300912121 is an apocalyptic number.

It is an amenable number.

19300912121 is a deficient number, since it is larger than the sum of its proper divisors (1).

19300912121 is an equidigital number, since it uses as much as digits as its factorization.

19300912121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 19300912121 in words is "nineteen billion, three hundred million, nine hundred twelve thousand, one hundred twenty-one".