45023221 has 4 divisors (see below), whose sum is σ = 45071712. Its totient is φ = 44974732.

The previous prime is 45023203. The next prime is 45023239. The reversal of 45023221 is 12232054.

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: 12232054 = 2 ⋅6116027.

It is an interprime number because it is at equal distance from previous prime (45023203) and next prime (45023239).

It is a cyclic number.

It is not a de Polignac number, because 45023221 - 2⁹ = 45022709 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 (45023291) 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, 22825 + ... + 24718.

It is an arithmetic number, because the mean of its divisors is an integer number (11267928).

Almost surely, 2^45023221 is an apocalyptic number.

It is an amenable number.

45023221 is a deficient number, since it is larger than the sum of its proper divisors (48491).

45023221 is an equidigital number, since it uses as much as digits as its factorization.

45023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48490.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 45023221 is about 6709.9345004255. The cubic root of 45023221 is about 355.7505011280.

Adding to 45023221 its reverse (12232054), we get a palindrome (57255275).

The spelling of 45023221 in words is "forty-five million, twenty-three thousand, two hundred twenty-one".