45005421 has 4 divisors (see below), whose sum is σ = 60007232. Its totient is φ = 30003612.

The previous prime is 45005393. The next prime is 45005437. The reversal of 45005421 is 12450054.

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.

It is not a de Polignac number, because 45005421 - 2⁹ = 45004909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45005491) 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, 7500901 + ... + 7500906.

It is an arithmetic number, because the mean of its divisors is an integer number (15001808).

Almost surely, 2^45005421 is an apocalyptic number.

It is an amenable number.

45005421 is a deficient number, since it is larger than the sum of its proper divisors (15001811).

45005421 is a wasteful number, since it uses less digits than its factorization.

45005421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15001810.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 45005421 is about 6708.6079778148. The cubic root of 45005421 is about 355.7036127782.

Adding to 45005421 its reverse (12450054), we get a palindrome (57455475).

The spelling of 45005421 in words is "forty-five million, five thousand, four hundred twenty-one".