2211240665 has 16 divisors (see below), whose sum is σ = 2667055248. Its totient is φ = 1759973376.

The previous prime is 2211240637. The next prime is 2211240673. The reversal of 2211240665 is 5660421122.

It can be written as a sum of positive squares in 8 ways, for example, as 102961609 + 2108279056 = 10147^2 + 45916^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211240665 - 2¹² = 2211236569 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 998099 + ... + 1000311.

It is an arithmetic number, because the mean of its divisors is an integer number (166690953).

Almost surely, 2^2211240665 is an apocalyptic number.

It is an amenable number.

2211240665 is a deficient number, since it is larger than the sum of its proper divisors (455814583).

2211240665 is a wasteful number, since it uses less digits than its factorization.

2211240665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3148.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 2211240665 is about 47023.8308201278. The cubic root of 2211240665 is about 1302.8027626464.

Adding to 2211240665 its reverse (5660421122), we get a palindrome (7871661787).

The spelling of 2211240665 in words is "two billion, two hundred eleven million, two hundred forty thousand, six hundred sixty-five".