11543502321 has 32 divisors (see below), whose sum is σ = 18423659520. Its totient is φ = 7101119232.

The previous prime is 11543502221. The next prime is 11543502329. The reversal of 11543502321 is 12320534511.

11543502321 is a `hidden beast` number, since 1 + 154 + 3 + 502 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 11543502321 - 2²³ = 11535113713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11543502329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1518496 + ... + 1526078.

It is an arithmetic number, because the mean of its divisors is an integer number (575739360).

Almost surely, 2^11543502321 is an apocalyptic number.

It is an amenable number.

11543502321 is a deficient number, since it is larger than the sum of its proper divisors (6880157199).

11543502321 is a wasteful number, since it uses less digits than its factorization.

11543502321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11942 (or 11936 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 11543502321 in words is "eleven billion, five hundred forty-three million, five hundred two thousand, three hundred twenty-one".