221081911055 has 8 divisors (see below), whose sum is σ = 265320560112. Its totient is φ = 176850684288.

The previous prime is 221081911033. The next prime is 221081911091. The reversal of 221081911055 is 550119180122.

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 221081911055 - 2²⁸ = 220813475599 is a prime.

It is a super-2 number, since 2×221081911055² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1789829 + ... + 1909358.

It is an arithmetic number, because the mean of its divisors is an integer number (33165070014).

Almost surely, 2^221081911055 is an apocalyptic number.

221081911055 is a deficient number, since it is larger than the sum of its proper divisors (44238649057).

221081911055 is a wasteful number, since it uses less digits than its factorization.

221081911055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3711145.

The product of its (nonzero) digits is 7200, while the sum is 35.

The spelling of 221081911055 in words is "two hundred twenty-one billion, eighty-one million, nine hundred eleven thousand, fifty-five".