45223221 has 16 divisors (see below), whose sum is σ = 63092736. Its totient is φ = 28758576.

The previous prime is 45223219. The next prime is 45223223. The reversal of 45223221 is 12232254.

It is an interprime number because it is at equal distance from previous prime (45223219) and next prime (45223223).

It is not a de Polignac number, because 45223221 - 2¹ = 45223219 is a prime.

It is a super-2 number, since 2×45223221² = 4090279435229682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45223223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34056 + ... + 35358.

It is an arithmetic number, because the mean of its divisors is an integer number (3943296).

Almost surely, 2^45223221 is an apocalyptic number.

It is an amenable number.

45223221 is a deficient number, since it is larger than the sum of its proper divisors (17869515).

45223221 is a wasteful number, since it uses less digits than its factorization.

45223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832.

The product of its digits is 960, while the sum is 21.

The square root of 45223221 is about 6724.8212615652. The cubic root of 45223221 is about 356.2764890122.

Adding to 45223221 its reverse (12232254), we get a palindrome (57455475).

It can be divided in two parts, 4 and 5223221, that added together give a palindrome (5223225).

The spelling of 45223221 in words is "forty-five million, two hundred twenty-three thousand, two hundred twenty-one".