221636714444221 has 16 divisors (see below), whose sum is σ = 223000396598848. Its totient is φ = 220276772179200.

The previous prime is 221636714444213. The next prime is 221636714444237. The reversal of 221636714444221 is 122444417636122.

It is a cyclic number.

It is not a de Polignac number, because 221636714444221 - 2³ = 221636714444213 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 (221636754444221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1672146211 + ... + 1672278751.

It is an arithmetic number, because the mean of its divisors is an integer number (13937524787428).

Almost surely, 2^{221636714444221} is an apocalyptic number.

It is an amenable number.

221636714444221 is a deficient number, since it is larger than the sum of its proper divisors (1363682154627).

221636714444221 is a wasteful number, since it uses less digits than its factorization.

221636714444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146572.

The product of its digits is 3096576, while the sum is 49.

The spelling of 221636714444221 in words is "two hundred twenty-one trillion, six hundred thirty-six billion, seven hundred fourteen million, four hundred forty-four thousand, two hundred twenty-one".