100002121871 has 2 divisors, whose sum is σ = 100002121872. Its totient is φ = 100002121870.

The previous prime is 100002121859. The next prime is 100002121943. The reversal of 100002121871 is 178121200001.

It is a weak prime.

It is an emirp because it is prime and its reverse (178121200001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100002121871 - 2³⁴ = 82822252687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100002121771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50001060935 + 50001060936.

It is an arithmetic number, because the mean of its divisors is an integer number (50001060936).

Almost surely, 2^100002121871 is an apocalyptic number.

100002121871 is a deficient number, since it is larger than the sum of its proper divisors (1).

100002121871 is an equidigital number, since it uses as much as digits as its factorization.

100002121871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 100002121871 its reverse (178121200001), we get a palindrome (278123321872).

The spelling of 100002121871 in words is "one hundred billion, two million, one hundred twenty-one thousand, eight hundred seventy-one".