221405133 has 4 divisors (see below), whose sum is σ = 295206848. Its totient is φ = 147603420.

The previous prime is 221405123. The next prime is 221405137. The reversal of 221405133 is 331504122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221405133 - 2⁴ = 221405117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221405137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36900853 + ... + 36900858.

It is an arithmetic number, because the mean of its divisors is an integer number (73801712).

Almost surely, 2^221405133 is an apocalyptic number.

It is an amenable number.

221405133 is a deficient number, since it is larger than the sum of its proper divisors (73801715).

221405133 is an equidigital number, since it uses as much as digits as its factorization.

221405133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73801714.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221405133 is about 14879.6886056127. The cubic root of 221405133 is about 604.9635777085.

Adding to 221405133 its reverse (331504122), we get a palindrome (552909255).

The spelling of 221405133 in words is "two hundred twenty-one million, four hundred five thousand, one hundred thirty-three".