10021002221 has 4 divisors (see below), whose sum is σ = 10024344444. Its totient is φ = 10017660000.

The previous prime is 10021002151. The next prime is 10021002239. The reversal of 10021002221 is 12220012001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12220012001 = 5647 ⋅2163983.

It can be written as a sum of positive squares in 2 ways, for example, as 3673693321 + 6347308900 = 60611^2 + 79670^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021002221 - 2²⁶ = 9953893357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021002241) 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, 1666610 + ... + 1672611.

It is an arithmetic number, because the mean of its divisors is an integer number (2506086111).

Almost surely, 2^10021002221 is an apocalyptic number.

It is an amenable number.

10021002221 is a deficient number, since it is larger than the sum of its proper divisors (3342223).

10021002221 is an equidigital number, since it uses as much as digits as its factorization.

10021002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342222.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10021002221 its reverse (12220012001), we get a palindrome (22241014222).

The spelling of 10021002221 in words is "ten billion, twenty-one million, two thousand, two hundred twenty-one".