221642061171155 has 4 divisors (see below), whose sum is σ = 265970473405392. Its totient is φ = 177313648936920.

The previous prime is 221642061171143. The next prime is 221642061171197. The reversal of 221642061171155 is 551171160246122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221642061171155 - 2³⁸ = 221367183264211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22164206117111 + ... + 22164206117120.

It is an arithmetic number, because the mean of its divisors is an integer number (66492618351348).

Almost surely, 2^{221642061171155} is an apocalyptic number.

221642061171155 is a deficient number, since it is larger than the sum of its proper divisors (44328412234237).

221642061171155 is an equidigital number, since it uses as much as digits as its factorization.

221642061171155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44328412234236.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 221642061171155 in words is "two hundred twenty-one trillion, six hundred forty-two billion, sixty-one million, one hundred seventy-one thousand, one hundred fifty-five".