221671665210611 has 32 divisors (see below), whose sum is σ = 276568313932800. Its totient is φ = 172607179852800.

The previous prime is 221671665210559. The next prime is 221671665210713. The reversal of 221671665210611 is 116012566176122.

It is not a de Polignac number, because 221671665210611 - 2⁶ = 221671665210547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221671665210211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 666092546 + ... + 666425256.

It is an arithmetic number, because the mean of its divisors is an integer number (8642759810400).

Almost surely, 2^{221671665210611} is an apocalyptic number.

221671665210611 is a deficient number, since it is larger than the sum of its proper divisors (54896648722189).

221671665210611 is a wasteful number, since it uses less digits than its factorization.

221671665210611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338915.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 221671665210611 in words is "two hundred twenty-one trillion, six hundred seventy-one billion, six hundred sixty-five million, two hundred ten thousand, six hundred eleven".