221671161167138 has 16 divisors (see below), whose sum is σ = 336323910343680. Its totient is φ = 109565839107456.

The previous prime is 221671161167009. The next prime is 221671161167179. The reversal of 221671161167138 is 831761161176122.

It is a happy number.

It is a super-2 number, since 2×221671161167138² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221671161167138.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661845818 + ... + 662180661.

It is an arithmetic number, because the mean of its divisors is an integer number (21020244396480).

Almost surely, 2^{221671161167138} is an apocalyptic number.

221671161167138 is a deficient number, since it is larger than the sum of its proper divisors (114652749176542).

221671161167138 is a wasteful number, since it uses less digits than its factorization.

221671161167138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324027441.

The product of its digits is 1016064, while the sum is 53.

The spelling of 221671161167138 in words is "two hundred twenty-one trillion, six hundred seventy-one billion, one hundred sixty-one million, one hundred sixty-seven thousand, one hundred thirty-eight".