4243554680121 has 27 divisors (see below), whose sum is σ = 6194297001711. Its totient is φ = 2799475611264.

The previous prime is 4243554680107. The next prime is 4243554680137. The reversal of 4243554680121 is 1210864553424.

The square root of 4243554680121 is 2059989.

It is a perfect power (a square), and thus also a powerful number.

4243554680121 is a `hidden beast` number, since 4 + 2 + 4 + 3 + 5 + 546 + 80 + 1 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1905517964025 + 2338036716096 = 1380405^2 + 1529064^2 .

It is not a de Polignac number, because 4243554680121 - 2²⁵ = 4243521125689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4243554680171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 599453260 + ... + 599460338.

Almost surely, 2^{4243554680121} is an apocalyptic number.

4243554680121 is the 2059989-th square number.

4243554680121 is the 1029995-th centered octagonal number.

It is an amenable number.

4243554680121 is a deficient number, since it is larger than the sum of its proper divisors (1950742321590).

4243554680121 is an frugal number, since it uses more digits than its factorization.

4243554680121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14358 (or 7179 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 4243554680121 in words is "four trillion, two hundred forty-three billion, five hundred fifty-four million, six hundred eighty thousand, one hundred twenty-one".