221701711718 has 4 divisors (see below), whose sum is σ = 332552567580. Its totient is φ = 110850855858.

The previous prime is 221701711631. The next prime is 221701711727. The reversal of 221701711718 is 817117107122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 817117107122 = 2 ⋅408558553561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55425427928 + ... + 55425427931.

It is an arithmetic number, because the mean of its divisors is an integer number (83138141895).

Almost surely, 2^221701711718 is an apocalyptic number.

221701711718 is a deficient number, since it is larger than the sum of its proper divisors (110850855862).

221701711718 is a wasteful number, since it uses less digits than its factorization.

221701711718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110850855861.

The product of its (nonzero) digits is 10976, while the sum is 38.

The spelling of 221701711718 in words is "two hundred twenty-one billion, seven hundred one million, seven hundred eleven thousand, seven hundred eighteen".