221239191696 has 160 divisors (see below), whose sum is σ = 611297064960. Its totient is φ = 68743116288.

The previous prime is 221239191661. The next prime is 221239191697. The reversal of 221239191696 is 696191932122.

It is not an unprimeable number, because it can be changed into a prime (221239191697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75584185 + ... + 75587111.

It is an arithmetic number, because the mean of its divisors is an integer number (3820606656).

Almost surely, 2^221239191696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221239191696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305648532480).

221239191696 is an abundant number, since it is smaller than the sum of its proper divisors (390057873264).

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

221239191696 is a wasteful number, since it uses less digits than its factorization.

221239191696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4261 (or 4255 counting only the distinct ones).

The product of its digits is 629856, while the sum is 51.

The spelling of 221239191696 in words is "two hundred twenty-one billion, two hundred thirty-nine million, one hundred ninety-one thousand, six hundred ninety-six".