100001320021 has 2 divisors, whose sum is σ = 100001320022. Its totient is φ = 100001320020.

The previous prime is 100001320019. The next prime is 100001320033. The reversal of 100001320021 is 120023100001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94395803121 + 5605516900 = 307239^2 + 74870^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001320021 - 2¹ = 100001320019 is a prime.

Together with 100001320019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001320921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000660010 + 50000660011.

It is an arithmetic number, because the mean of its divisors is an integer number (50000660011).

Almost surely, 2^100001320021 is an apocalyptic number.

It is an amenable number.

100001320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001320021 is an equidigital number, since it uses as much as digits as its factorization.

100001320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 100001320021 its reverse (120023100001), we get a palindrome (220024420022).

The spelling of 100001320021 in words is "one hundred billion, one million, three hundred twenty thousand, twenty-one".