221354249 has 4 divisors (see below), whose sum is σ = 221675280. Its totient is φ = 221033220.

The previous prime is 221354233. The next prime is 221354261. The reversal of 221354249 is 942453122.

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 221354249 - 2⁴ = 221354233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221354279) 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, 159479 + ... + 160860.

It is an arithmetic number, because the mean of its divisors is an integer number (55418820).

Almost surely, 2^221354249 is an apocalyptic number.

It is an amenable number.

221354249 is a deficient number, since it is larger than the sum of its proper divisors (321031).

221354249 is an equidigital number, since it uses as much as digits as its factorization.

221354249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321030.

The product of its digits is 17280, while the sum is 32.

The square root of 221354249 is about 14877.9786597508. The cubic root of 221354249 is about 604.9172293022.

The spelling of 221354249 in words is "two hundred twenty-one million, three hundred fifty-four thousand, two hundred forty-nine".