1321185642 has 32 divisors (see below), whose sum is σ = 3151153152. Its totient is φ = 361069104.

The previous prime is 1321185637. The next prime is 1321185647. The reversal of 1321185642 is 2465811231.

It is an interprime number because it is at equal distance from previous prime (1321185637) and next prime (1321185647).

It is not an unprimeable number, because it can be changed into a prime (1321185647) 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, 682878 + ... + 684809.

It is an arithmetic number, because the mean of its divisors is an integer number (98473536).

Almost surely, 2^1321185642 is an apocalyptic number.

1321185642 is an abundant number, since it is smaller than the sum of its proper divisors (1829967510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321185642 is a wasteful number, since it uses less digits than its factorization.

1321185642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367722.

The product of its digits is 11520, while the sum is 33.

The square root of 1321185642 is about 36348.1174478129. The cubic root of 1321185642 is about 1097.2896474031.

Adding to 1321185642 its reverse (2465811231), we get a palindrome (3786996873).

The spelling of 1321185642 in words is "one billion, three hundred twenty-one million, one hundred eighty-five thousand, six hundred forty-two".