221685516870 has 16 divisors (see below), whose sum is σ = 532045240560. Its totient is φ = 59116137824.

The previous prime is 221685516869. The next prime is 221685516881. The reversal of 221685516870 is 78615586122.

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, 3694758585 + ... + 3694758644.

It is an arithmetic number, because the mean of its divisors is an integer number (33252827535).

Almost surely, 2^221685516870 is an apocalyptic number.

221685516870 is an abundant number, since it is smaller than the sum of its proper divisors (310359723690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221685516870 is a wasteful number, since it uses less digits than its factorization.

221685516870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389517239.

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 221685516870 in words is "two hundred twenty-one billion, six hundred eighty-five million, five hundred sixteen thousand, eight hundred seventy".