1187212321 has 8 divisors (see below), whose sum is σ = 1304032320. Its totient is φ = 1075825872.

The previous prime is 1187212319. The next prime is 1187212361. The reversal of 1187212321 is 1232127811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1187212321 - 2¹ = 1187212319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1187212321.

It is not an unprimeable number, because it can be changed into a prime (1187212361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1357930 + ... + 1358803.

It is an arithmetic number, because the mean of its divisors is an integer number (163004040).

Almost surely, 2^1187212321 is an apocalyptic number.

It is an amenable number.

1187212321 is a deficient number, since it is larger than the sum of its proper divisors (116819999).

1187212321 is a wasteful number, since it uses less digits than its factorization.

1187212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716775.

The product of its digits is 1344, while the sum is 28.

The square root of 1187212321 is about 34455.9475417525. The cubic root of 1187212321 is about 1058.8703763509.

The spelling of 1187212321 in words is "one billion, one hundred eighty-seven million, two hundred twelve thousand, three hundred twenty-one".