221025365 has 8 divisors (see below), whose sum is σ = 289342368. Its totient is φ = 160745680.

The previous prime is 221025361. The next prime is 221025373. The reversal of 221025365 is 563520122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221025365 - 2² = 221025361 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221025361) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2009267 + ... + 2009376.

It is an arithmetic number, because the mean of its divisors is an integer number (36167796).

Almost surely, 2^221025365 is an apocalyptic number.

It is an amenable number.

221025365 is a deficient number, since it is larger than the sum of its proper divisors (68317003).

221025365 is a wasteful number, since it uses less digits than its factorization.

221025365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4018659.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 221025365 is about 14866.9218401120. The cubic root of 221025365 is about 604.6174892381.

Adding to 221025365 its reverse (563520122), we get a palindrome (784545487).

The spelling of 221025365 in words is "two hundred twenty-one million, twenty-five thousand, three hundred sixty-five".