221320240 has 40 divisors (see below), whose sum is σ = 515266128. Its totient is φ = 88408320.

The previous prime is 221320223. The next prime is 221320243. The reversal of 221320240 is 42023122.

221320240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (221320243) 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, 79675 + ... + 82405.

Almost surely, 2^221320240 is an apocalyptic number.

221320240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221320240 is an abundant number, since it is smaller than the sum of its proper divisors (293945888).

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

221320240 is a wasteful number, since it uses less digits than its factorization.

221320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757 (or 3751 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221320240 is about 14876.8356850508. The cubic root of 221320240 is about 604.8862477665.

Adding to 221320240 its reverse (42023122), we get a palindrome (263343362).

The spelling of 221320240 in words is "two hundred twenty-one million, three hundred twenty thousand, two hundred forty".