100001202021 has 40 divisors (see below), whose sum is σ = 179710710080. Its totient is φ = 54135983232.

The previous prime is 100001201917. The next prime is 100001202029. The reversal of 100001202021 is 120202100001.

It is not a de Polignac number, because 100001202021 - 2⁷ = 100001201893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100001201994 and 100001202012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001202029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4630516 + ... + 4652061.

It is an arithmetic number, because the mean of its divisors is an integer number (4492767752).

Almost surely, 2^100001202021 is an apocalyptic number.

It is an amenable number.

100001202021 is a deficient number, since it is larger than the sum of its proper divisors (79709508059).

100001202021 is an equidigital number, since it uses as much as digits as its factorization.

100001202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9282615 (or 9282606 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 100001202021 its reverse (120202100001), we get a palindrome (220203302022).

The spelling of 100001202021 in words is "one hundred billion, one million, two hundred two thousand, twenty-one".