221025263 has 4 divisors (see below), whose sum is σ = 221731728. Its totient is φ = 220318800.

The previous prime is 221025247. The next prime is 221025281. The reversal of 221025263 is 362520122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221025263 - 2⁴ = 221025247 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 (221025223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 352763 + ... + 353388.

It is an arithmetic number, because the mean of its divisors is an integer number (55432932).

Almost surely, 2^221025263 is an apocalyptic number.

221025263 is a deficient number, since it is larger than the sum of its proper divisors (706465).

221025263 is an equidigital number, since it uses as much as digits as its factorization.

221025263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706464.

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

The square root of 221025263 is about 14866.9184096772. The cubic root of 221025263 is about 604.6173962307.

Adding to 221025263 its reverse (362520122), we get a palindrome (583545385).

The spelling of 221025263 in words is "two hundred twenty-one million, twenty-five thousand, two hundred sixty-three".