202100011021 has 4 divisors (see below), whose sum is σ = 202409506332. Its totient is φ = 201790515712.

The previous prime is 202100010991. The next prime is 202100011063. The reversal of 202100011021 is 120110001202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103208630121 + 98891380900 = 321261^2 + 314470^2 .

It is a cyclic number.

It is not a de Polignac number, because 202100011021 - 2²¹ = 202097913869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202100010989 and 202100011007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202100011081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154746676 + ... + 154747981.

It is an arithmetic number, because the mean of its divisors is an integer number (50602376583).

Almost surely, 2^202100011021 is an apocalyptic number.

It is an amenable number.

202100011021 is a deficient number, since it is larger than the sum of its proper divisors (309495311).

202100011021 is an equidigital number, since it uses as much as digits as its factorization.

202100011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309495310.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 202100011021 its reverse (120110001202), we get a palindrome (322210012223).

The spelling of 202100011021 in words is "two hundred two billion, one hundred million, eleven thousand, twenty-one".