221709104 has 40 divisors (see below), whose sum is σ = 456274368. Its totient is φ = 104002560.

The previous prime is 221709091. The next prime is 221709113. The reversal of 221709104 is 401907122.

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, 98714 + ... + 100934.

Almost surely, 2^221709104 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 221709104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228137184).

221709104 is an abundant number, since it is smaller than the sum of its proper divisors (234565264).

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

221709104 is a wasteful number, since it uses less digits than its factorization.

221709104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613 (or 2607 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 221709104 is about 14889.8993952276. The cubic root of 221709104 is about 605.2403061496.

The spelling of 221709104 in words is "two hundred twenty-one million, seven hundred nine thousand, one hundred four".