221696000 has 104 divisors (see below), whose sum is σ = 554563464. Its totient is φ = 88473600.

The previous prime is 221695993. The next prime is 221696017. The reversal of 221696000 is 696122.

It can be written as a sum of positive squares in 4 ways, for example, as 39337984 + 182358016 = 6272^2 + 13504^2 .

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, 511784 + ... + 512216.

It is an arithmetic number, because the mean of its divisors is an integer number (5332341).

Almost surely, 2^221696000 is an apocalyptic number.

221696000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221696000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277281732).

221696000 is an abundant number, since it is smaller than the sum of its proper divisors (332867464).

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

221696000 is an frugal number, since it uses more digits than its factorization.

221696000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 221696000 is about 14889.4593588888. The cubic root of 221696000 is about 605.2283817780.

The spelling of 221696000 in words is "two hundred twenty-one million, six hundred ninety-six thousand".