928148520802121 has 4 divisors (see below), whose sum is σ = 928150970503044. Its totient is φ = 928146071101200.

The previous prime is 928148520802049. The next prime is 928148520802123. The reversal of 928148520802121 is 121208025841829.

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 630609480339721 + 297539040462400 = 25111939^2 + 17249320^2 .

It is a cyclic number.

It is not a de Polignac number, because 928148520802121 - 2⁴⁶ = 857779776624457 is a prime.

It is a super-2 number, since 2×928148520802121² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (928148520802123) 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, 1224282050 + ... + 1225039931.

It is an arithmetic number, because the mean of its divisors is an integer number (232037742625761).

Almost surely, 2^{928148520802121} is an apocalyptic number.

It is an amenable number.

928148520802121 is a deficient number, since it is larger than the sum of its proper divisors (2449700923).

928148520802121 is a wasteful number, since it uses less digits than its factorization.

928148520802121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449700922.

The product of its (nonzero) digits is 1474560, while the sum is 53.

The spelling of 928148520802121 in words is "nine hundred twenty-eight trillion, one hundred forty-eight billion, five hundred twenty million, eight hundred two thousand, one hundred twenty-one".