221340403 has 12 divisors (see below), whose sum is σ = 230495160. Its totient is φ = 212531040.

The previous prime is 221340377. The next prime is 221340409. The reversal of 221340403 is 304043122.

It is a de Polignac number, because none of the positive numbers 2^k-221340403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221340409) 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, 132751 + ... + 134407.

It is an arithmetic number, because the mean of its divisors is an integer number (19207930).

Almost surely, 2^221340403 is an apocalyptic number.

221340403 is a deficient number, since it is larger than the sum of its proper divisors (9154757).

221340403 is a wasteful number, since it uses less digits than its factorization.

221340403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858 (or 1827 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 221340403 is about 14877.5133338875. The cubic root of 221340403 is about 604.9046162492.

Adding to 221340403 its reverse (304043122), we get a palindrome (525383525).

The spelling of 221340403 in words is "two hundred twenty-one million, three hundred forty thousand, four hundred three".