221324145 has 16 divisors (see below), whose sum is σ = 404707200. Its totient is φ = 101176704.

The previous prime is 221324119. The next prime is 221324161. The reversal of 221324145 is 541423122.

It is not a de Polignac number, because 221324145 - 2⁵ = 221324113 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1053820 + ... + 1054029.

It is an arithmetic number, because the mean of its divisors is an integer number (25294200).

Almost surely, 2^221324145 is an apocalyptic number.

It is an amenable number.

221324145 is a deficient number, since it is larger than the sum of its proper divisors (183383055).

221324145 is a wasteful number, since it uses less digits than its factorization.

221324145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107864.

The product of its digits is 1920, while the sum is 24.

The square root of 221324145 is about 14876.9669287795. The cubic root of 221324145 is about 604.8898053066.

Adding to 221324145 its reverse (541423122), we get a palindrome (762747267).

The spelling of 221324145 in words is "two hundred twenty-one million, three hundred twenty-four thousand, one hundred forty-five".