45130021 has 4 divisors (see below), whose sum is σ = 45150912. Its totient is φ = 45109132.

The previous prime is 45130013. The next prime is 45130037. The reversal of 45130021 is 12003154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12003154 = 2 ⋅6001577.

It is a cyclic number.

It is not a de Polignac number, because 45130021 - 2³ = 45130013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45129977 and 45130004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45130081) 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, 6775 + ... + 11668.

It is an arithmetic number, because the mean of its divisors is an integer number (11287728).

Almost surely, 2^45130021 is an apocalyptic number.

It is an amenable number.

45130021 is a deficient number, since it is larger than the sum of its proper divisors (20891).

45130021 is a wasteful number, since it uses less digits than its factorization.

45130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20890.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 45130021 is about 6717.8881354187. Note that the first 3 decimals coincide. The cubic root of 45130021 is about 356.0315720221.

Adding to 45130021 its reverse (12003154), we get a palindrome (57133175).

The spelling of 45130021 in words is "forty-five million, one hundred thirty thousand, twenty-one".