221855672 has 8 divisors (see below), whose sum is σ = 415979400. Its totient is φ = 110927832.

The previous prime is 221855639. The next prime is 221855681. The reversal of 221855672 is 276558122.

221855672 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13865972 + ... + 13865987.

It is an arithmetic number, because the mean of its divisors is an integer number (51997425).

Almost surely, 2^221855672 is an apocalyptic number.

It is an amenable number.

221855672 is a deficient number, since it is larger than the sum of its proper divisors (194123728).

221855672 is a wasteful number, since it uses less digits than its factorization.

221855672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27731965 (or 27731961 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 221855672 is about 14894.8203077446. The cubic root of 221855672 is about 605.3736480209.

The spelling of 221855672 in words is "two hundred twenty-one million, eight hundred fifty-five thousand, six hundred seventy-two".