221275870 has 32 divisors (see below), whose sum is σ = 416467008. Its totient is φ = 84488448.

The previous prime is 221275867. The next prime is 221275871. The reversal of 221275870 is 78572122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221275871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201162 + ... + 202258.

It is an arithmetic number, because the mean of its divisors is an integer number (13014594).

Almost surely, 2^221275870 is an apocalyptic number.

221275870 is a deficient number, since it is larger than the sum of its proper divisors (195191138).

221275870 is a wasteful number, since it uses less digits than its factorization.

221275870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 221275870 is about 14875.3443657618. The cubic root of 221275870 is about 604.8458227899.

The spelling of 221275870 in words is "two hundred twenty-one million, two hundred seventy-five thousand, eight hundred seventy".