221863616 has 28 divisors (see below), whose sum is σ = 474128592. Its totient is φ = 102398208.

The previous prime is 221863597. The next prime is 221863619. The reversal of 221863616 is 616368122.

221863616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (221863619) 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, 132500 + ... + 134163.

It is an arithmetic number, because the mean of its divisors is an integer number (16933164).

Almost surely, 2^221863616 is an apocalyptic number.

221863616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221863616 is an abundant number, since it is smaller than the sum of its proper divisors (252264976).

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

221863616 is a wasteful number, since it uses less digits than its factorization.

221863616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266688 (or 266678 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 221863616 is about 14895.0869752412. The cubic root of 221863616 is about 605.3808734854.

The spelling of 221863616 in words is "two hundred twenty-one million, eight hundred sixty-three thousand, six hundred sixteen".