221220288 has 56 divisors (see below), whose sum is σ = 650351760. Its totient is φ = 73739520.

The previous prime is 221220283. The next prime is 221220289. The reversal of 221220288 is 882022122.

221220288 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62283 + ... + 65738.

Almost surely, 2^221220288 is an apocalyptic number.

It is an amenable number.

221220288 is an abundant number, since it is smaller than the sum of its proper divisors (429131472).

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

221220288 is a wasteful number, since it uses less digits than its factorization.

221220288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128042 (or 128026 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 221220288 is about 14873.4759891560. The cubic root of 221220288 is about 604.7951750686.

It can be divided in two parts, 2212 and 20288, that added together give a square (22500 = 150²).

The spelling of 221220288 in words is "two hundred twenty-one million, two hundred twenty thousand, two hundred eighty-eight".