221048045 has 8 divisors (see below), whose sum is σ = 265363224. Its totient is φ = 176768064.

The previous prime is 221048029. The next prime is 221048053. The reversal of 221048045 is 540840122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22857961 + 198190084 = 4781^2 + 14078^2 .

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 221048045 - 2⁴ = 221048029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7907 + ... + 22463.

It is an arithmetic number, because the mean of its divisors is an integer number (33170403).

Almost surely, 2^221048045 is an apocalyptic number.

It is an amenable number.

221048045 is a deficient number, since it is larger than the sum of its proper divisors (44315179).

221048045 is a wasteful number, since it uses less digits than its factorization.

221048045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17599.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 221048045 is about 14867.6845877225. The cubic root of 221048045 is about 604.6381689999.

Adding to 221048045 its reverse (540840122), we get a palindrome (761888167).

The spelling of 221048045 in words is "two hundred twenty-one million, forty-eight thousand, forty-five".