45105021 has 24 divisors (see below), whose sum is σ = 71137976. Its totient is φ = 27371520.

The previous prime is 45105017. The next prime is 45105037. The reversal of 45105021 is 12050154.

It can be written as a sum of positive squares in 4 ways, for example, as 27225 + 45077796 = 165^2 + 6714^2 .

It is not a de Polignac number, because 45105021 - 2² = 45105017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 45104985 and 45105003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45105041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5901 + ... + 11181.

Almost surely, 2^45105021 is an apocalyptic number.

It is an amenable number.

45105021 is a deficient number, since it is larger than the sum of its proper divisors (26032955).

45105021 is a wasteful number, since it uses less digits than its factorization.

45105021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373 (or 5370 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 45105021 is about 6716.0271738581. The cubic root of 45105021 is about 355.9658180580.

Adding to 45105021 its reverse (12050154), we get a palindrome (57155175).

The spelling of 45105021 in words is "forty-five million, one hundred five thousand, twenty-one".