221334133465 has 4 divisors (see below), whose sum is σ = 265600960164. Its totient is φ = 177067306768.

The previous prime is 221334133451. The next prime is 221334133483. The reversal of 221334133465 is 564331433122.

It is a happy number.

221334133465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40889288521 + 180444844944 = 202211^2 + 424788^2 .

It is a cyclic number.

It is not a de Polignac number, because 221334133465 - 2⁹ = 221334132953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22133413342 + ... + 22133413351.

It is an arithmetic number, because the mean of its divisors is an integer number (66400240041).

Almost surely, 2^221334133465 is an apocalyptic number.

It is an amenable number.

221334133465 is a deficient number, since it is larger than the sum of its proper divisors (44266826699).

221334133465 is an equidigital number, since it uses as much as digits as its factorization.

221334133465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44266826698.

The product of its digits is 155520, while the sum is 37.

Adding to 221334133465 its reverse (564331433122), we get a palindrome (785665566587).

The spelling of 221334133465 in words is "two hundred twenty-one billion, three hundred thirty-four million, one hundred thirty-three thousand, four hundred sixty-five".