11221404665 has 8 divisors (see below), whose sum is σ = 13534040520. Its totient is φ = 8931553792.

The previous prime is 11221404653. The next prime is 11221404713. The reversal of 11221404665 is 56640412211.

It can be written as a sum of positive squares in 4 ways, for example, as 5923457296 + 5297947369 = 76964^2 + 72787^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11221404665 - 2⁸ = 11221404409 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 5695160 + ... + 5697129.

It is an arithmetic number, because the mean of its divisors is an integer number (1691755065).

Almost surely, 2^11221404665 is an apocalyptic number.

It is an amenable number.

11221404665 is a deficient number, since it is larger than the sum of its proper divisors (2312635855).

11221404665 is a wasteful number, since it uses less digits than its factorization.

11221404665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11392491.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 11221404665 its reverse (56640412211), we get a palindrome (67861816876).

The spelling of 11221404665 in words is "eleven billion, two hundred twenty-one million, four hundred four thousand, six hundred sixty-five".