11531055321 has 16 divisors (see below), whose sum is σ = 17084995200. Its totient is φ = 7686492624.

The previous prime is 11531055299. The next prime is 11531055343. The reversal of 11531055321 is 12355013511.

11531055321 is a `hidden beast` number, since 115 + 3 + 10 + 5 + 532 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (11531055299) and next prime (11531055343).

It is not a de Polignac number, because 11531055321 - 2⁶ = 11531055257 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (11531051321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290415 + ... + 327723.

It is an arithmetic number, because the mean of its divisors is an integer number (1067812200).

Almost surely, 2^11531055321 is an apocalyptic number.

It is an amenable number.

11531055321 is a deficient number, since it is larger than the sum of its proper divisors (5553939879).

11531055321 is a wasteful number, since it uses less digits than its factorization.

11531055321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48765 (or 48759 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

Adding to 11531055321 its reverse (12355013511), we get a palindrome (23886068832).

The spelling of 11531055321 in words is "eleven billion, five hundred thirty-one million, fifty-five thousand, three hundred twenty-one".