221311274 has 4 divisors (see below), whose sum is σ = 331966914. Its totient is φ = 110655636.

The previous prime is 221311271. The next prime is 221311303. The reversal of 221311274 is 472113122.

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

It can be written as a sum of positive squares in only one way, i.e., 182061049 + 39250225 = 13493^2 + 6265^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221311271) 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 as a sum of consecutive naturals, namely, 55327817 + ... + 55327820.

Almost surely, 2^221311274 is an apocalyptic number.

221311274 is a deficient number, since it is larger than the sum of its proper divisors (110655640).

221311274 is a wasteful number, since it uses less digits than its factorization.

221311274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110655639.

The product of its digits is 672, while the sum is 23.

The square root of 221311274 is about 14876.5343410352. The cubic root of 221311274 is about 604.8780793867.

Adding to 221311274 its reverse (472113122), we get a palindrome (693424396).

The spelling of 221311274 in words is "two hundred twenty-one million, three hundred eleven thousand, two hundred seventy-four".