9120212230221 has 12 divisors (see below), whose sum is σ = 13177877188060. Its totient is φ = 6078185809920.

The previous prime is 9120212230219. The next prime is 9120212230271. The reversal of 9120212230221 is 1220322120219.

9120212230221 is a `hidden beast` number, since 9 + 1 + 202 + 1 + 2 + 230 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 633122576100 + 8487089654121 = 795690^2 + 2913261^2 .

It is not a de Polignac number, because 9120212230221 - 2¹ = 9120212230219 is a prime.

It is a super-2 number, since 2×9120212230221² (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 (9120212230201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162943540 + ... + 162999501.

Almost surely, 2^{9120212230221} is an apocalyptic number.

It is an amenable number.

9120212230221 is a deficient number, since it is larger than the sum of its proper divisors (4057664957839).

9120212230221 is a wasteful number, since it uses less digits than its factorization.

9120212230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325946156 (or 325946153 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 9120212230221 in words is "nine trillion, one hundred twenty billion, two hundred twelve million, two hundred thirty thousand, two hundred twenty-one".