11528301921821 has 2 divisors, whose sum is σ = 11528301921822. Its totient is φ = 11528301921820.

The previous prime is 11528301921803. The next prime is 11528301921841. The reversal of 11528301921821 is 12812910382511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9628522116196 + 1899779805625 = 3102986^2 + 1378325^2 .

It is a cyclic number.

It is not a de Polignac number, because 11528301921821 - 2¹⁰ = 11528301920797 is a prime.

It is a super-3 number, since 3×11528301921821³ (a number of 40 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11528301921841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5764150960910 + 5764150960911.

It is an arithmetic number, because the mean of its divisors is an integer number (5764150960911).

Almost surely, 2^{11528301921821} is an apocalyptic number.

It is an amenable number.

11528301921821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11528301921821 is an equidigital number, since it uses as much as digits as its factorization.

11528301921821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 44.

The spelling of 11528301921821 in words is "eleven trillion, five hundred twenty-eight billion, three hundred one million, nine hundred twenty-one thousand, eight hundred twenty-one".