221994918117 has 36 divisors (see below), whose sum is σ = 373131273216. Its totient is φ = 126813632400.

The previous prime is 221994918113. The next prime is 221994918163. The reversal of 221994918117 is 711819499122.

221994918117 is a `hidden beast` number, since 22 + 19 + 9 + 491 + 8 + 117 = 666.

It is not a de Polignac number, because 221994918117 - 2² = 221994918113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221994918113) by changing a digit.

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 in 35 ways as a sum of consecutive naturals, for example, 1326492 + ... + 1484442.

Almost surely, 2^221994918117 is an apocalyptic number.

It is an amenable number.

221994918117 is a deficient number, since it is larger than the sum of its proper divisors (151136355099).

221994918117 is a wasteful number, since it uses less digits than its factorization.

221994918117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161158 (or 161148 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The spelling of 221994918117 in words is "two hundred twenty-one billion, nine hundred ninety-four million, nine hundred eighteen thousand, one hundred seventeen".