100000202021 has 4 divisors (see below), whose sum is σ = 100001277612. Its totient is φ = 99999126432.

The previous prime is 100000202009. The next prime is 100000202023. The reversal of 100000202021 is 120202000001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17580108100 + 82420093921 = 132590^2 + 287089^2 .

It is a cyclic number.

It is not a de Polignac number, because 100000202021 - 2¹⁸ = 99999939877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000202023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383600 + ... + 589193.

It is an arithmetic number, because the mean of its divisors is an integer number (25000319403).

Almost surely, 2^100000202021 is an apocalyptic number.

It is an amenable number.

100000202021 is a deficient number, since it is larger than the sum of its proper divisors (1075591).

100000202021 is an equidigital number, since it uses as much as digits as its factorization.

100000202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075590.

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

Adding to 100000202021 its reverse (120202000001), we get a palindrome (220202202022).

The spelling of 100000202021 in words is "one hundred billion, two hundred two thousand, twenty-one".