221253245 has 16 divisors (see below), whose sum is σ = 270630720. Its totient is φ = 173599104.

The previous prime is 221253191. The next prime is 221253247. The reversal of 221253245 is 542352122.

221253245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221253245 - 2¹⁰ = 221252221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221253247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231689 + ... + 232641.

It is an arithmetic number, because the mean of its divisors is an integer number (16914420).

Almost surely, 2^221253245 is an apocalyptic number.

It is an amenable number.

221253245 is a deficient number, since it is larger than the sum of its proper divisors (49377475).

221253245 is an equidigital number, since it uses as much as digits as its factorization.

221253245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804.

The product of its digits is 4800, while the sum is 26.

The square root of 221253245 is about 14874.5838597253. The cubic root of 221253245 is about 604.8252073425.

The spelling of 221253245 in words is "two hundred twenty-one million, two hundred fifty-three thousand, two hundred forty-five".