221867236164 has 192 divisors, whose sum is σ = 675506442240. Its totient is φ = 55142830080.

The previous prime is 221867236163. The next prime is 221867236169. The reversal of 221867236164 is 461632768122.

It is not an unprimeable number, because it can be changed into a prime (221867236163) by changing a digit.

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 in 63 ways as a sum of consecutive naturals, for example, 1012689 + ... + 1212135.

It is an arithmetic number, because the mean of its divisors is an integer number (3518262720).

Almost surely, 2^221867236164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221867236164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337753221120).

221867236164 is an abundant number, since it is smaller than the sum of its proper divisors (453639206076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221867236164 is a wasteful number, since it uses less digits than its factorization.

221867236164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199538 (or 199536 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 48.

The spelling of 221867236164 in words is "two hundred twenty-one billion, eight hundred sixty-seven million, two hundred thirty-six thousand, one hundred sixty-four".