100000020971 has 2 divisors, whose sum is σ = 100000020972. Its totient is φ = 100000020970.

The previous prime is 100000020959. The next prime is 100000021001. The reversal of 100000020971 is 179020000001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100000020971 is a prime.

It is not a weakly prime, because it can be changed into another prime (100000020271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000010485 + 50000010486.

It is an arithmetic number, because the mean of its divisors is an integer number (50000010486).

Almost surely, 2^100000020971 is an apocalyptic number.

100000020971 is a deficient number, since it is larger than the sum of its proper divisors (1).

100000020971 is an equidigital number, since it uses as much as digits as its factorization.

100000020971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

Adding to 100000020971 its reverse (179020000001), we get a palindrome (279020020972).

The spelling of 100000020971 in words is "one hundred billion, twenty thousand, nine hundred seventy-one".