221671855550 has 24 divisors (see below), whose sum is σ = 412430986656. Its totient is φ = 88642648640.

The previous prime is 221671855507. The next prime is 221671855607. The reversal of 221671855550 is 55558176122.

It is a junction number, because it is equal to n+sod(n) for n = 221671855495 and 221671855504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480287 + ... + 820986.

It is an arithmetic number, because the mean of its divisors is an integer number (17184624444).

Almost surely, 2^221671855550 is an apocalyptic number.

221671855550 is a deficient number, since it is larger than the sum of its proper divisors (190759131106).

221671855550 is a wasteful number, since it uses less digits than its factorization.

221671855550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304692 (or 1304687 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 47.

The spelling of 221671855550 in words is "two hundred twenty-one billion, six hundred seventy-one million, eight hundred fifty-five thousand, five hundred fifty".