221695870 has 16 divisors (see below), whose sum is σ = 435330288. Its totient is φ = 80616640.

The previous prime is 221695847. The next prime is 221695879. The reversal of 221695870 is 78596122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221695879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1007599 + ... + 1007818.

It is an arithmetic number, because the mean of its divisors is an integer number (27208143).

Almost surely, 2^221695870 is an apocalyptic number.

221695870 is a deficient number, since it is larger than the sum of its proper divisors (213634418).

221695870 is a wasteful number, since it uses less digits than its factorization.

221695870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015435.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 221695870 is about 14889.4549933837. The cubic root of 221695870 is about 605.2282634783.

The spelling of 221695870 in words is "two hundred twenty-one million, six hundred ninety-five thousand, eight hundred seventy".