221705630822721 has 8 divisors (see below), whose sum is σ = 299169044002080. Its totient is φ = 146022985762592.

The previous prime is 221705630822707. The next prime is 221705630822723. The reversal of 221705630822721 is 127228036507122.

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

It is a cyclic number.

It is not a de Polignac number, because 221705630822721 - 2¹⁵ = 221705630789953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221705630822723) 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, 445192029516 + ... + 445192030013.

It is an arithmetic number, because the mean of its divisors is an integer number (37396130500260).

Almost surely, 2^{221705630822721} is an apocalyptic number.

It is an amenable number.

221705630822721 is a deficient number, since it is larger than the sum of its proper divisors (77463413179359).

221705630822721 is an equidigital number, since it uses as much as digits as its factorization.

221705630822721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890384059615.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 221705630822721 in words is "two hundred twenty-one trillion, seven hundred five billion, six hundred thirty million, eight hundred twenty-two thousand, seven hundred twenty-one".