221640237141164 has 12 divisors (see below), whose sum is σ = 387870773547600. Its totient is φ = 110820016127568.

The previous prime is 221640237141163. The next prime is 221640237141179. The reversal of 221640237141164 is 461141732046122.

It is not an unprimeable number, because it can be changed into a prime (221640237141161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20635379 + ... + 29480490.

It is an arithmetic number, because the mean of its divisors is an integer number (32322564462300).

Almost surely, 2^{221640237141164} is an apocalyptic number.

It is an amenable number.

221640237141164 is a deficient number, since it is larger than the sum of its proper divisors (166230536406436).

221640237141164 is a wasteful number, since it uses less digits than its factorization.

221640237141164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51221512 (or 51221510 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

Adding to 221640237141164 its reverse (461141732046122), we get a palindrome (682781969187286).

The spelling of 221640237141164 in words is "two hundred twenty-one trillion, six hundred forty billion, two hundred thirty-seven million, one hundred forty-one thousand, one hundred sixty-four".