221036416 has 32 divisors (see below), whose sum is σ = 441368280. Its totient is φ = 110261760.

The previous prime is 221036411. The next prime is 221036423. The reversal of 221036416 is 614630122.

221036416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221036411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61090 + ... + 64606.

Almost surely, 2^221036416 is an apocalyptic number.

It is an amenable number.

221036416 is a deficient number, since it is larger than the sum of its proper divisors (220331864).

221036416 is an equidigital number, since it uses as much as digits as its factorization.

221036416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022 (or 4010 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 221036416 is about 14867.2934994908. The cubic root of 221036416 is about 604.6275657838.

Adding to 221036416 its reverse (614630122), we get a palindrome (835666538).

The spelling of 221036416 in words is "two hundred twenty-one million, thirty-six thousand, four hundred sixteen".