4045532121 has 20 divisors (see below), whose sum is σ = 6045315364. Its totient is φ = 2696133600.

The previous prime is 4045532107. The next prime is 4045532171. The reversal of 4045532121 is 1212355404.

4045532121 is a `hidden beast` number, since 4 + 0 + 4 + 5 + 532 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2156673600 + 1888858521 = 46440^2 + 43461^2 .

It is not a de Polignac number, because 4045532121 - 2⁷ = 4045531993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4045532171) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 319491 + ... + 331911.

Almost surely, 2^4045532121 is an apocalyptic number.

It is an amenable number.

4045532121 is a deficient number, since it is larger than the sum of its proper divisors (1999783243).

4045532121 is a wasteful number, since it uses less digits than its factorization.

4045532121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16454 (or 16445 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 4045532121 is about 63604.4976475721. The cubic root of 4045532121 is about 1593.4014862579.

Adding to 4045532121 its reverse (1212355404), we get a palindrome (5257887525).

The spelling of 4045532121 in words is "four billion, forty-five million, five hundred thirty-two thousand, one hundred twenty-one".