221205053 has 6 divisors (see below), whose sum is σ = 231241374. Its totient is φ = 211586936.

The previous prime is 221205031. The next prime is 221205091. The reversal of 221205053 is 350502122.

It can be written as a sum of positive squares in only one way, i.e., 220760164 + 444889 = 14858^2 + 667^2 .

It is a de Polignac number, because none of the positive numbers 2^k-221205053 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 (221205013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208550 + ... + 209607.

It is an arithmetic number, because the mean of its divisors is an integer number (38540229).

Almost surely, 2^221205053 is an apocalyptic number.

221205053 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

221205053 is a deficient number, since it is larger than the sum of its proper divisors (10036321).

221205053 is an equidigital number, since it uses as much as digits as its factorization.

221205053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418203 (or 418180 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 221205053 is about 14872.9638270252. The cubic root of 221205053 is about 604.7812910707.

Adding to 221205053 its reverse (350502122), we get a palindrome (571707175).

The spelling of 221205053 in words is "two hundred twenty-one million, two hundred five thousand, fifty-three".