221340056 has 24 divisors (see below), whose sum is σ = 482770620. Its totient is φ = 94859856.

The previous prime is 221340043. The next prime is 221340059. The reversal of 221340056 is 650043122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221340059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 281930 + ... + 282713.

Almost surely, 2^221340056 is an apocalyptic number.

It is an amenable number.

221340056 is an abundant number, since it is smaller than the sum of its proper divisors (261430564).

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

221340056 is a wasteful number, since it uses less digits than its factorization.

221340056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564663 (or 564652 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 221340056 is about 14877.5016719878. The cubic root of 221340056 is about 604.9043001419.

Adding to 221340056 its reverse (650043122), we get a palindrome (871383178).

The spelling of 221340056 in words is "two hundred twenty-one million, three hundred forty thousand, fifty-six".