221225045 has 4 divisors (see below), whose sum is σ = 265470060. Its totient is φ = 176980032.

The previous prime is 221225027. The next prime is 221225051. The reversal of 221225045 is 540522122.

221225045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113252164 + 107972881 = 10642^2 + 10391^2 .

It is a cyclic number.

It is not a de Polignac number, because 221225045 - 2¹⁴ = 221208661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221225045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22122500 + ... + 22122509.

It is an arithmetic number, because the mean of its divisors is an integer number (66367515).

Almost surely, 2^221225045 is an apocalyptic number.

It is an amenable number.

221225045 is a deficient number, since it is larger than the sum of its proper divisors (44245015).

221225045 is an equidigital number, since it uses as much as digits as its factorization.

221225045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44245014.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 221225045 is about 14873.6359038401. The cubic root of 221225045 is about 604.7995100990.

Adding to 221225045 its reverse (540522122), we get a palindrome (761747167).

The spelling of 221225045 in words is "two hundred twenty-one million, two hundred twenty-five thousand, forty-five".