11641487821 has 2 divisors, whose sum is σ = 11641487822. Its totient is φ = 11641487820.

The previous prime is 11641487791. The next prime is 11641487831. The reversal of 11641487821 is 12878414611.

11641487821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10118146921 + 1523340900 = 100589^2 + 39030^2 .

It is a cyclic number.

It is not a de Polignac number, because 11641487821 - 2¹⁵ = 11641455053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11641487831) 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 as a sum of consecutive naturals, namely, 5820743910 + 5820743911.

It is an arithmetic number, because the mean of its divisors is an integer number (5820743911).

Almost surely, 2^11641487821 is an apocalyptic number.

It is an amenable number.

11641487821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11641487821 is an equidigital number, since it uses as much as digits as its factorization.

11641487821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 43.

The spelling of 11641487821 in words is "eleven billion, six hundred forty-one million, four hundred eighty-seven thousand, eight hundred twenty-one".