221420353 has 16 divisors (see below), whose sum is σ = 276885504. Its totient is φ = 172017360.

The previous prime is 221420347. The next prime is 221420363. The reversal of 221420353 is 353024122.

It is a cyclic number.

It is not a de Polignac number, because 221420353 - 2¹³ = 221412161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221420323) by changing a digit.

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, 22576 + ... + 30862.

It is an arithmetic number, because the mean of its divisors is an integer number (17305344).

Almost surely, 2^221420353 is an apocalyptic number.

It is an amenable number.

221420353 is a deficient number, since it is larger than the sum of its proper divisors (55465151).

221420353 is a wasteful number, since it uses less digits than its factorization.

221420353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8652.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 221420353 is about 14880.2000322576. The cubic root of 221420353 is about 604.9774396797.

Adding to 221420353 its reverse (353024122), we get a palindrome (574444475).

The spelling of 221420353 in words is "two hundred twenty-one million, four hundred twenty thousand, three hundred fifty-three".