221336016 has 80 divisors (see below), whose sum is σ = 656624640. Its totient is φ = 63538560.

The previous prime is 221335991. The next prime is 221336023. The reversal of 221336016 is 610633122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1000 + ... + 21063.

It is an arithmetic number, because the mean of its divisors is an integer number (8207808).

Almost surely, 2^221336016 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 221336016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328312320).

221336016 is an abundant number, since it is smaller than the sum of its proper divisors (435288624).

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

221336016 is a wasteful number, since it uses less digits than its factorization.

221336016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22104 (or 22098 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 221336016 is about 14877.3658958836. The cubic root of 221336016 is about 604.9006197894.

Adding to 221336016 its reverse (610633122), we get a palindrome (831969138).

The spelling of 221336016 in words is "two hundred twenty-one million, three hundred thirty-six thousand, sixteen".