11521711066121 has 4 divisors (see below), whose sum is σ = 11521717910544. Its totient is φ = 11521704221700.

The previous prime is 11521711066087. The next prime is 11521711066163. The reversal of 11521711066121 is 12166011712511.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11521711066121 is a prime.

It is a super-2 number, since 2×11521711066121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11521711066421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057586 + ... + 4915476.

It is an arithmetic number, because the mean of its divisors is an integer number (2880429477636).

Almost surely, 2^{11521711066121} is an apocalyptic number.

It is an amenable number.

11521711066121 is a deficient number, since it is larger than the sum of its proper divisors (6844423).

11521711066121 is an equidigital number, since it uses as much as digits as its factorization.

11521711066121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6844422.

The product of its (nonzero) digits is 5040, while the sum is 35.

Adding to 11521711066121 its reverse (12166011712511), we get a palindrome (23687722778632).

The spelling of 11521711066121 in words is "eleven trillion, five hundred twenty-one billion, seven hundred eleven million, sixty-six thousand, one hundred twenty-one".