11015640521 has 2 divisors, whose sum is σ = 11015640522. Its totient is φ = 11015640520.

The previous prime is 11015640509. The next prime is 11015640523. The reversal of 11015640521 is 12504651011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10268984896 + 746655625 = 101336^2 + 27325^2 .

It is a cyclic number.

It is not a de Polignac number, because 11015640521 - 2¹⁰ = 11015639497 is a prime.

Together with 11015640523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11015640523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5507820260 + 5507820261.

It is an arithmetic number, because the mean of its divisors is an integer number (5507820261).

Almost surely, 2^11015640521 is an apocalyptic number.

It is an amenable number.

11015640521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11015640521 is an equidigital number, since it uses as much as digits as its factorization.

11015640521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

The spelling of 11015640521 in words is "eleven billion, fifteen million, six hundred forty thousand, five hundred twenty-one".