221230340 has 48 divisors (see below), whose sum is σ = 471284352. Its totient is φ = 87227136.

The previous prime is 221230337. The next prime is 221230343. The reversal of 221230340 is 43032122.

221230340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221230337) and next prime (221230343).

It is not an unprimeable number, because it can be changed into a prime (221230343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720467 + ... + 720773.

It is an arithmetic number, because the mean of its divisors is an integer number (9818424).

Almost surely, 2^221230340 is an apocalyptic number.

221230340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221230340 is an abundant number, since it is smaller than the sum of its proper divisors (250054012).

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

221230340 is a wasteful number, since it uses less digits than its factorization.

221230340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 221230340 is about 14873.8139022915. The cubic root of 221230340 is about 604.8043353330.

Adding to 221230340 its reverse (43032122), we get a palindrome (264262462).

The spelling of 221230340 in words is "two hundred twenty-one million, two hundred thirty thousand, three hundred forty".