100021009857871 has 2 divisors, whose sum is σ = 100021009857872. Its totient is φ = 100021009857870.

The previous prime is 100021009857859. The next prime is 100021009858013. The reversal of 100021009857871 is 178758900120001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100021009857871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100021009852871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010504928935 + 50010504928936.

It is an arithmetic number, because the mean of its divisors is an integer number (50010504928936).

Almost surely, 2^{100021009857871} is an apocalyptic number.

100021009857871 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021009857871 is an equidigital number, since it uses as much as digits as its factorization.

100021009857871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 49.

Adding to 100021009857871 its reverse (178758900120001), we get a palindrome (278779909977872).

The spelling of 100021009857871 in words is "one hundred trillion, twenty-one billion, nine million, eight hundred fifty-seven thousand, eight hundred seventy-one".