4545243021 has 16 divisors (see below), whose sum is σ = 6619000320. Its totient is φ = 2751468720.

The previous prime is 4545242969. The next prime is 4545243071. The reversal of 4545243021 is 1203425454.

It is not a de Polignac number, because 4545243021 - 2²¹ = 4543145869 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4545243021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4545243071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51825 + ... + 108518.

It is an arithmetic number, because the mean of its divisors is an integer number (413687520).

Almost surely, 2^4545243021 is an apocalyptic number.

It is an amenable number.

4545243021 is a deficient number, since it is larger than the sum of its proper divisors (2073757299).

4545243021 is a wasteful number, since it uses less digits than its factorization.

4545243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161216.

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 4545243021 is about 67418.4175207339. The cubic root of 4545243021 is about 1656.4781166164.

Adding to 4545243021 its reverse (1203425454), we get a palindrome (5748668475).

The spelling of 4545243021 in words is "four billion, five hundred forty-five million, two hundred forty-three thousand, twenty-one".