221603045 has 16 divisors (see below), whose sum is σ = 278035200. Its totient is φ = 169238784.

The previous prime is 221603029. The next prime is 221603051. The reversal of 221603045 is 540306122.

It is not a de Polignac number, because 221603045 - 2⁴ = 221603029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 221603045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67277 + ... + 70493.

It is an arithmetic number, because the mean of its divisors is an integer number (17377200).

Almost surely, 2^221603045 is an apocalyptic number.

It is an amenable number.

221603045 is a deficient number, since it is larger than the sum of its proper divisors (56432155).

221603045 is a wasteful number, since it uses less digits than its factorization.

221603045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 221603045 is about 14886.3375280826. The cubic root of 221603045 is about 605.1437811402.

Adding to 221603045 its reverse (540306122), we get a palindrome (761909167).

The spelling of 221603045 in words is "two hundred twenty-one million, six hundred three thousand, forty-five".