221344340 has 48 divisors (see below), whose sum is σ = 548373504. Its totient is φ = 73440000.

The previous prime is 221344313. The next prime is 221344367. The reversal of 221344340 is 43443122.

It is an interprime number because it is at equal distance from previous prime (221344313) and next prime (221344367).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21161 + ... + 29840.

It is an arithmetic number, because the mean of its divisors is an integer number (11424448).

Almost surely, 2^221344340 is an apocalyptic number.

221344340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221344340 is an abundant number, since it is smaller than the sum of its proper divisors (327029164).

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

221344340 is a wasteful number, since it uses less digits than its factorization.

221344340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51048 (or 51046 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 221344340 is about 14877.6456470774. The cubic root of 221344340 is about 604.9082027241.

Adding to 221344340 its reverse (43443122), we get a palindrome (264787462).

The spelling of 221344340 in words is "two hundred twenty-one million, three hundred forty-four thousand, three hundred forty".