221255016 has 32 divisors (see below), whose sum is σ = 553660800. Its totient is φ = 73681920.

The previous prime is 221255011. The next prime is 221255033. The reversal of 221255016 is 610552122.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (221255011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25800 + ... + 33288.

It is an arithmetic number, because the mean of its divisors is an integer number (17301900).

Almost surely, 2^221255016 is an apocalyptic number.

It is an amenable number.

221255016 is an abundant number, since it is smaller than the sum of its proper divisors (332405784).

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

221255016 is a wasteful number, since it uses less digits than its factorization.

221255016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8729 (or 8725 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 221255016 is about 14874.6433906834. The cubic root of 221255016 is about 604.8268210930.

The spelling of 221255016 in words is "two hundred twenty-one million, two hundred fifty-five thousand, sixteen".