221646221613221 has 8 divisors (see below), whose sum is σ = 221684269435200. Its totient is φ = 221608174944832.

The previous prime is 221646221613211. The next prime is 221646221613259. The reversal of 221646221613221 is 122316122646122.

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-221646221613221 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 (221646221613211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441395936 + ... + 441897798.

It is an arithmetic number, because the mean of its divisors is an integer number (27710533679400).

Almost surely, 2^{221646221613221} is an apocalyptic number.

It is an amenable number.

221646221613221 is a deficient number, since it is larger than the sum of its proper divisors (38047821979).

221646221613221 is an equidigital number, since it uses as much as digits as its factorization.

221646221613221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576795.

The product of its digits is 165888, while the sum is 41.

The spelling of 221646221613221 in words is "two hundred twenty-one trillion, six hundred forty-six billion, two hundred twenty-one million, six hundred thirteen thousand, two hundred twenty-one".