221345275 has 12 divisors (see below), whose sum is σ = 275196672. Its totient is φ = 176606240.

The previous prime is 221345273. The next prime is 221345291. The reversal of 221345275 is 572543122.

It is not a de Polignac number, because 221345275 - 2¹ = 221345273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221345273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1984 + ... + 21133.

It is an arithmetic number, because the mean of its divisors is an integer number (22933056).

Almost surely, 2^221345275 is an apocalyptic number.

221345275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221345275 is a deficient number, since it is larger than the sum of its proper divisors (53851397).

221345275 is a wasteful number, since it uses less digits than its factorization.

221345275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23510 (or 23505 counting only the distinct ones).

The product of its digits is 16800, while the sum is 31.

The square root of 221345275 is about 14877.6770700268. The cubic root of 221345275 is about 604.9090544714.

Adding to 221345275 its reverse (572543122), we get a palindrome (793888397).

The spelling of 221345275 in words is "two hundred twenty-one million, three hundred forty-five thousand, two hundred seventy-five".