221221253 has 4 divisors (see below), whose sum is σ = 241332288. Its totient is φ = 201110220.

The previous prime is 221221249. The next prime is 221221327. The reversal of 221221253 is 352122122.

221221253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221221253 - 2² = 221221249 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 (221221213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10055501 + ... + 10055522.

It is an arithmetic number, because the mean of its divisors is an integer number (60333072).

Almost surely, 2^221221253 is an apocalyptic number.

It is an amenable number.

221221253 is a deficient number, since it is larger than the sum of its proper divisors (20111035).

221221253 is a wasteful number, since it uses less digits than its factorization.

221221253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20111034.

The product of its digits is 480, while the sum is 20.

The square root of 221221253 is about 14873.5084294191. The cubic root of 221221253 is about 604.7960544733.

Adding to 221221253 its reverse (352122122), we get a palindrome (573343375).

The spelling of 221221253 in words is "two hundred twenty-one million, two hundred twenty-one thousand, two hundred fifty-three".