11505450521421 has 12 divisors (see below), whose sum is σ = 16662375694848. Its totient is φ = 7650273451464.

The previous prime is 11505450521407. The next prime is 11505450521429. The reversal of 11505450521421 is 12412505450511.

11505450521421 is a `hidden beast` number, since 1 + 1 + 5 + 0 + 5 + 4 + 505 + 2 + 142 + 1 = 666.

11505450521421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11505450521421 - 2¹⁰ = 11505450520397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11505450521429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1668904375 + ... + 1668911268.

It is an arithmetic number, because the mean of its divisors is an integer number (1388531307904).

Almost surely, 2^{11505450521421} is an apocalyptic number.

It is an amenable number.

11505450521421 is a deficient number, since it is larger than the sum of its proper divisors (5156925173427).

11505450521421 is a wasteful number, since it uses less digits than its factorization.

11505450521421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337816032 (or 3337816029 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

Adding to 11505450521421 its reverse (12412505450511), we get a palindrome (23917955971932).

The spelling of 11505450521421 in words is "eleven trillion, five hundred five billion, four hundred fifty million, five hundred twenty-one thousand, four hundred twenty-one".