11505351321 has 16 divisors (see below), whose sum is σ = 17046659520. Its totient is φ = 7669471680.

The previous prime is 11505351301. The next prime is 11505351359. The reversal of 11505351321 is 12315350511.

11505351321 is a `hidden beast` number, since 115 + 0 + 535 + 13 + 2 + 1 = 666.

It is not a de Polignac number, because 11505351321 - 2⁵ = 11505351289 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 (11505351301) 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 15 ways as a sum of consecutive naturals, for example, 430726 + ... + 456656.

It is an arithmetic number, because the mean of its divisors is an integer number (1065416220).

Almost surely, 2^11505351321 is an apocalyptic number.

It is an amenable number.

11505351321 is a deficient number, since it is larger than the sum of its proper divisors (5541308199).

11505351321 is a wasteful number, since it uses less digits than its factorization.

11505351321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42373 (or 42367 counting only the distinct ones).

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

The spelling of 11505351321 in words is "eleven billion, five hundred five million, three hundred fifty-one thousand, three hundred twenty-one".