11681763221 has 4 divisors (see below), whose sum is σ = 11708373600. Its totient is φ = 11655152844.

The previous prime is 11681763211. The next prime is 11681763281. The reversal of 11681763221 is 12236718611.

11681763221 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11681763221 - 2¹⁴ = 11681746837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11681763211) 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, 13304531 + ... + 13305408.

It is an arithmetic number, because the mean of its divisors is an integer number (2927093400).

Almost surely, 2^11681763221 is an apocalyptic number.

It is an amenable number.

11681763221 is a deficient number, since it is larger than the sum of its proper divisors (26610379).

11681763221 is an equidigital number, since it uses as much as digits as its factorization.

11681763221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26610378.

The product of its digits is 24192, while the sum is 38.

The spelling of 11681763221 in words is "eleven billion, six hundred eighty-one million, seven hundred sixty-three thousand, two hundred twenty-one".