221316755 has 16 divisors (see below), whose sum is σ = 292599648. Its totient is φ = 159360000.

The previous prime is 221316737. The next prime is 221316779. The reversal of 221316755 is 557613122.

It is not a de Polignac number, because 221316755 - 2⁶ = 221316691 is a prime.

It is a super-2 number, since 2×221316755² = 97962212087460050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14366 + ... + 25475.

It is an arithmetic number, because the mean of its divisors is an integer number (18287478).

Almost surely, 2^221316755 is an apocalyptic number.

221316755 is a deficient number, since it is larger than the sum of its proper divisors (71282893).

221316755 is a wasteful number, since it uses less digits than its factorization.

221316755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39958.

The product of its digits is 12600, while the sum is 32.

The square root of 221316755 is about 14876.7185561870. The cubic root of 221316755 is about 604.8830728201.

Adding to 221316755 its reverse (557613122), we get a palindrome (778929877).

The spelling of 221316755 in words is "two hundred twenty-one million, three hundred sixteen thousand, seven hundred fifty-five".