10000220021 has 4 divisors (see below), whose sum is σ = 10909330944. Its totient is φ = 9091109100.

The previous prime is 10000219997. The next prime is 10000220023. The reversal of 10000220021 is 12002200001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10000220021 - 2¹⁰ = 10000218997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10000219990 and 10000220008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000220023) 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 3 ways as a sum of consecutive naturals, for example, 454555445 + ... + 454555466.

It is an arithmetic number, because the mean of its divisors is an integer number (2727332736).

Almost surely, 2^10000220021 is an apocalyptic number.

10000220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10000220021 is a deficient number, since it is larger than the sum of its proper divisors (909110923).

10000220021 is an equidigital number, since it uses as much as digits as its factorization.

10000220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909110922.

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

Adding to 10000220021 its reverse (12002200001), we get a palindrome (22002420022).

The spelling of 10000220021 in words is "ten billion, two hundred twenty thousand, twenty-one".