2211240661 has 8 divisors (see below), whose sum is σ = 2531807744. Its totient is φ = 1891842480.

The previous prime is 2211240637. The next prime is 2211240673. The reversal of 2211240661 is 1660421122.

It is a happy number.

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 2211240661 - 2⁷ = 2211240533 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 (2211240961) 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 7 ways as a sum of consecutive naturals, for example, 288165 + ... + 295738.

It is an arithmetic number, because the mean of its divisors is an integer number (316475968).

Almost surely, 2^2211240661 is an apocalyptic number.

It is an amenable number.

2211240661 is a deficient number, since it is larger than the sum of its proper divisors (320567083).

2211240661 is an equidigital number, since it uses as much as digits as its factorization.

2211240661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584451.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2211240661 is about 47023.8307775962. The cubic root of 2211240661 is about 1302.8027618608.

Adding to 2211240661 its reverse (1660421122), we get a palindrome (3871661783).

The spelling of 2211240661 in words is "two billion, two hundred eleven million, two hundred forty thousand, six hundred sixty-one".