45115021 has 4 divisors (see below), whose sum is σ = 51560032. Its totient is φ = 38670012.

The previous prime is 45115019. The next prime is 45115043. The reversal of 45115021 is 12051154.

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: 12051154 = 2 ⋅6025577.

It is a cyclic number.

It is not a de Polignac number, because 45115021 - 2¹ = 45115019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 45115021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45115001) 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, 3222495 + ... + 3222508.

It is an arithmetic number, because the mean of its divisors is an integer number (12890008).

Almost surely, 2^45115021 is an apocalyptic number.

It is an amenable number.

45115021 is a deficient number, since it is larger than the sum of its proper divisors (6445011).

45115021 is an equidigital number, since it uses as much as digits as its factorization.

45115021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445010.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 45115021 is about 6716.7716203545. The cubic root of 45115021 is about 355.9921225585.

Adding to 45115021 its reverse (12051154), we get a palindrome (57166175).

The spelling of 45115021 in words is "forty-five million, one hundred fifteen thousand, twenty-one".