9021021221021 has 4 divisors (see below), whose sum is σ = 9030648779292. Its totient is φ = 9011393662752.

The previous prime is 9021021220973. The next prime is 9021021221063. The reversal of 9021021221021 is 1201221201209.

9021021221021 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.

It can be written as a sum of positive squares in 2 ways, for example, as 4522168118521 + 4498853102500 = 2126539^2 + 2121050^2 .

It is a cyclic number.

It is not a de Polignac number, because 9021021221021 - 2³⁴ = 9003841351837 is a prime.

It is a super-2 number, since 2×9021021221021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9021021221521) 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, 4813777730 + ... + 4813779603.

It is an arithmetic number, because the mean of its divisors is an integer number (2257662194823).

Almost surely, 2^{9021021221021} is an apocalyptic number.

It is an amenable number.

9021021221021 is a deficient number, since it is larger than the sum of its proper divisors (9627558271).

9021021221021 is an equidigital number, since it uses as much as digits as its factorization.

9021021221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9627558270.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 9021021221021 in words is "nine trillion, twenty-one billion, twenty-one million, two hundred twenty-one thousand, twenty-one".