45212221 has 8 divisors (see below), whose sum is σ = 46360160. Its totient is φ = 44068752.

The previous prime is 45212213. The next prime is 45212263. The reversal of 45212221 is 12221254.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45212221 - 2³ = 45212213 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 (45212201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29746 + ... + 31228.

It is an arithmetic number, because the mean of its divisors is an integer number (5795020).

Almost surely, 2^45212221 is an apocalyptic number.

It is an amenable number.

45212221 is a deficient number, since it is larger than the sum of its proper divisors (1147939).

45212221 is a wasteful number, since it uses less digits than its factorization.

45212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235.

The product of its digits is 320, while the sum is 19.

The square root of 45212221 is about 6724.0033462217. The cubic root of 45212221 is about 356.2476000249.

Adding to 45212221 its reverse (12221254), we get a palindrome (57433475).

The spelling of 45212221 in words is "forty-five million, two hundred twelve thousand, two hundred twenty-one".