10011220221 has 4 divisors (see below), whose sum is σ = 13348293632. Its totient is φ = 6674146812.

The previous prime is 10011220211. The next prime is 10011220231. The reversal of 10011220221 is 12202211001.

10011220221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12202211001 = 3 ⋅4067403667.

It is an interprime number because it is at equal distance from previous prime (10011220211) and next prime (10011220231).

It is not a de Polignac number, because 10011220221 - 2¹⁴ = 10011203837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10011220197 and 10011220206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011220201) 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, 1668536701 + ... + 1668536706.

It is an arithmetic number, because the mean of its divisors is an integer number (3337073408).

Almost surely, 2^10011220221 is an apocalyptic number.

It is an amenable number.

10011220221 is a deficient number, since it is larger than the sum of its proper divisors (3337073411).

10011220221 is an equidigital number, since it uses as much as digits as its factorization.

10011220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337073410.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 10011220221 its reverse (12202211001), we get a palindrome (22213431222).

It can be divided in two parts, 1001 and 1220221, that multiplied together give a palindrome (1221441221).

The spelling of 10011220221 in words is "ten billion, eleven million, two hundred twenty thousand, two hundred twenty-one".