10021100209 has 4 divisors (see below), whose sum is σ = 10027149604. Its totient is φ = 10015050816.

The previous prime is 10021100179. The next prime is 10021100237. The reversal of 10021100209 is 90200112001.

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 6123845025 + 3897255184 = 78255^2 + 62428^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021100209 - 2⁷ = 10021100081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021100192 and 10021100201.

It is not an unprimeable number, because it can be changed into a prime (10021100009) 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, 3022212 + ... + 3025525.

It is an arithmetic number, because the mean of its divisors is an integer number (2506787401).

Almost surely, 2^10021100209 is an apocalyptic number.

It is an amenable number.

10021100209 is a deficient number, since it is larger than the sum of its proper divisors (6049395).

10021100209 is an equidigital number, since it uses as much as digits as its factorization.

10021100209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6049394.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 10021100209 in words is "ten billion, twenty-one million, one hundred thousand, two hundred nine".