221543227041671 has 8 divisors (see below), whose sum is σ = 238420676354544. Its totient is φ = 205093054926720.

The previous prime is 221543227041599. The next prime is 221543227041709. The reversal of 221543227041671 is 176140722345122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221543227041671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221543227041971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106819298405 + ... + 106819300478.

It is an arithmetic number, because the mean of its divisors is an integer number (29802584544318).

Almost surely, 2^{221543227041671} is an apocalyptic number.

221543227041671 is a deficient number, since it is larger than the sum of its proper divisors (16877449312873).

221543227041671 is a wasteful number, since it uses less digits than its factorization.

221543227041671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213638598961.

The product of its (nonzero) digits is 1128960, while the sum is 47.

Adding to 221543227041671 its reverse (176140722345122), we get a palindrome (397683949386793).

The spelling of 221543227041671 in words is "two hundred twenty-one trillion, five hundred forty-three billion, two hundred twenty-seven million, forty-one thousand, six hundred seventy-one".