10011221021 has 4 divisors (see below), whose sum is σ = 10034449344. Its totient is φ = 9987992700.

The previous prime is 10011220979. The next prime is 10011221029. The reversal of 10011221021 is 12012211001.

10011221021 is digitally balanced in base 2, 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: 12012211001 = 7 ⋅1716030143.

It is a cyclic number.

It is not a de Polignac number, because 10011221021 - 2¹⁰ = 10011219997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10011220993 and 10011221011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011221029) 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, 11613515 + ... + 11614376.

It is an arithmetic number, because the mean of its divisors is an integer number (2508612336).

Almost surely, 2^10011221021 is an apocalyptic number.

It is an amenable number.

10011221021 is a deficient number, since it is larger than the sum of its proper divisors (23228323).

10011221021 is an equidigital number, since it uses as much as digits as its factorization.

10011221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23228322.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10011221021 its reverse (12012211001), we get a palindrome (22023432022).

The spelling of 10011221021 in words is "ten billion, eleven million, two hundred twenty-one thousand, twenty-one".