11526545021 has 4 divisors (see below), whose sum is σ = 11684442972. Its totient is φ = 11368647072.

The previous prime is 11526545011. The next prime is 11526545039. The reversal of 11526545021 is 12054562511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12054562511 = 36559 ⋅329729.

It can be written as a sum of positive squares in 2 ways, for example, as 6777405625 + 4749139396 = 82325^2 + 68914^2 .

It is a cyclic number.

It is not a de Polignac number, because 11526545021 - 2¹⁰ = 11526543997 is a prime.

It is a super-2 number, since 2×11526545021² (a number of 21 digits) contains 22 as substring.

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 (11526545011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78948866 + ... + 78949011.

It is an arithmetic number, because the mean of its divisors is an integer number (2921110743).

Almost surely, 2^11526545021 is an apocalyptic number.

It is an amenable number.

11526545021 is a deficient number, since it is larger than the sum of its proper divisors (157897951).

11526545021 is an equidigital number, since it uses as much as digits as its factorization.

11526545021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157897950.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 11526545021 in words is "eleven billion, five hundred twenty-six million, five hundred forty-five thousand, twenty-one".