221274349 has 4 divisors (see below), whose sum is σ = 221473564. Its totient is φ = 221075136.

The previous prime is 221274331. The next prime is 221274353. The reversal of 221274349 is 943472122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 118657449 + 102616900 = 10893^2 + 10130^2 .

It is a cyclic number.

It is not a de Polignac number, because 221274349 - 2⁹ = 221273837 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 (221274359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97932 + ... + 100165.

It is an arithmetic number, because the mean of its divisors is an integer number (55368391).

Almost surely, 2^221274349 is an apocalyptic number.

It is an amenable number.

221274349 is a deficient number, since it is larger than the sum of its proper divisors (199215).

221274349 is a wasteful number, since it uses less digits than its factorization.

221274349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199214.

The product of its digits is 24192, while the sum is 34.

The square root of 221274349 is about 14875.2932408071. The cubic root of 221274349 is about 604.8444369292.

The spelling of 221274349 in words is "two hundred twenty-one million, two hundred seventy-four thousand, three hundred forty-nine".