221315355 has 32 divisors (see below), whose sum is σ = 406149120. Its totient is φ = 114225120.

The previous prime is 221315351. The next prime is 221315357. The reversal of 221315355 is 553513122.

It is a happy number.

It is not a de Polignac number, because 221315355 - 2² = 221315351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221315351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22257 + ... + 30626.

It is an arithmetic number, because the mean of its divisors is an integer number (12692160).

Almost surely, 2^221315355 is an apocalyptic number.

221315355 is a deficient number, since it is larger than the sum of its proper divisors (184833765).

221315355 is a wasteful number, since it uses less digits than its factorization.

221315355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52928 (or 52922 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 221315355 is about 14876.6715027253. The cubic root of 221315355 is about 604.8817973660.

Adding to 221315355 its reverse (553513122), we get a palindrome (774828477).

The spelling of 221315355 in words is "two hundred twenty-one million, three hundred fifteen thousand, three hundred fifty-five".