221836720 has 60 divisors (see below), whose sum is σ = 599988384. Its totient is φ = 76056960.

The previous prime is 221836717. The next prime is 221836729. The reversal of 221836720 is 27638122.

It is not an unprimeable number, because it can be changed into a prime (221836729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24376 + ... + 32215.

Almost surely, 2^221836720 is an apocalyptic number.

221836720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221836720 is an abundant number, since it is smaller than the sum of its proper divisors (378151664).

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

221836720 is a wasteful number, since it uses less digits than its factorization.

221836720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56618 (or 56605 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 221836720 is about 14894.1840998425. The cubic root of 221836720 is about 605.3564095343.

The spelling of 221836720 in words is "two hundred twenty-one million, eight hundred thirty-six thousand, seven hundred twenty".