100121999947 has 2 divisors, whose sum is σ = 100121999948. Its totient is φ = 100121999946.

The previous prime is 100121999893. The next prime is 100122000007. The reversal of 100121999947 is 749999121001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100121999947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100121999894 and 100121999903.

It is not a weakly prime, because it can be changed into another prime (100121993947) 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, 50060999973 + 50060999974.

It is an arithmetic number, because the mean of its divisors is an integer number (50060999974).

Almost surely, 2^100121999947 is an apocalyptic number.

100121999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121999947 is an equidigital number, since it uses as much as digits as its factorization.

100121999947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 52.

The spelling of 100121999947 in words is "one hundred billion, one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred forty-seven".