221425145 has 16 divisors (see below), whose sum is σ = 280160640. Its totient is φ = 167537664.

The previous prime is 221425093. The next prime is 221425199. The reversal of 221425145 is 541524122.

It is a cyclic number.

It is not a de Polignac number, because 221425145 - 2¹² = 221421049 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 69017 + ... + 72153.

It is an arithmetic number, because the mean of its divisors is an integer number (17510040).

Almost surely, 2^221425145 is an apocalyptic number.

It is an amenable number.

221425145 is a deficient number, since it is larger than the sum of its proper divisors (58735495).

221425145 is a wasteful number, since it uses less digits than its factorization.

221425145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904.

The product of its digits is 3200, while the sum is 26.

The square root of 221425145 is about 14880.3610507272. The cubic root of 221425145 is about 604.9818039743.

Adding to 221425145 its reverse (541524122), we get a palindrome (762949267).

The spelling of 221425145 in words is "two hundred twenty-one million, four hundred twenty-five thousand, one hundred forty-five".