9845223121 has 4 divisors (see below), whose sum is σ = 9848771172. Its totient is φ = 9841675072.

The previous prime is 9845223053. The next prime is 9845223187. The reversal of 9845223121 is 1213225489.

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 1824229521 + 8020993600 = 42711^2 + 89560^2 .

It is a cyclic number.

It is not a de Polignac number, because 9845223121 - 2¹¹ = 9845221073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9845233121) 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, 1769860 + ... + 1775413.

It is an arithmetic number, because the mean of its divisors is an integer number (2462192793).

Almost surely, 2^9845223121 is an apocalyptic number.

It is an amenable number.

9845223121 is a deficient number, since it is larger than the sum of its proper divisors (3548051).

9845223121 is a wasteful number, since it uses less digits than its factorization.

9845223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548050.

The product of its digits is 34560, while the sum is 37.

The square root of 9845223121 is about 99223.0977192307. The cubic root of 9845223121 is about 2143.2616232238.

The spelling of 9845223121 in words is "nine billion, eight hundred forty-five million, two hundred twenty-three thousand, one hundred twenty-one".