221311675418 has 4 divisors (see below), whose sum is σ = 331967513130. Its totient is φ = 110655837708.

The previous prime is 221311675379. The next prime is 221311675439. The reversal of 221311675418 is 814576113122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 814576113122 = 2 ⋅407288056561.

It can be written as a sum of positive squares in only one way, i.e., 209651347129 + 11660328289 = 457877^2 + 107983^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55327918853 + ... + 55327918856.

Almost surely, 2^221311675418 is an apocalyptic number.

221311675418 is a deficient number, since it is larger than the sum of its proper divisors (110655837712).

221311675418 is a wasteful number, since it uses less digits than its factorization.

221311675418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110655837711.

The product of its digits is 80640, while the sum is 41.

The spelling of 221311675418 in words is "two hundred twenty-one billion, three hundred eleven million, six hundred seventy-five thousand, four hundred eighteen".