221320740 has 48 divisors (see below), whose sum is σ = 652317120. Its totient is φ = 55912320.

The previous prime is 221320733. The next prime is 221320753. The reversal of 221320740 is 47023122.

221320740 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

221320740 is strictly pandigital in base 9.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 95931 + ... + 98210.

It is an arithmetic number, because the mean of its divisors is an integer number (13589940).

Almost surely, 2^221320740 is an apocalyptic number.

221320740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221320740 is an abundant number, since it is smaller than the sum of its proper divisors (430996380).

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

221320740 is a wasteful number, since it uses less digits than its factorization.

221320740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194172 (or 194170 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 221320740 is about 14876.8524896901. The cubic root of 221320740 is about 604.8867032797.

Adding to 221320740 its reverse (47023122), we get a palindrome (268343862).

The spelling of 221320740 in words is "two hundred twenty-one million, three hundred twenty thousand, seven hundred forty".