1321819218 has 12 divisors (see below), whose sum is σ = 2863941678. Its totient is φ = 440606400.

The previous prime is 1321819153. The next prime is 1321819237. The reversal of 1321819218 is 8129181231.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 722695689 + 599123529 = 26883^2 + 24477^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36717183 + ... + 36717218.

Almost surely, 2^1321819218 is an apocalyptic number.

1321819218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1321819218 is an abundant number, since it is smaller than the sum of its proper divisors (1542122460).

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

1321819218 is a wasteful number, since it uses less digits than its factorization.

1321819218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73434409 (or 73434406 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 1321819218 is about 36356.8317926631. The cubic root of 1321819218 is about 1097.4650215172.

The spelling of 1321819218 in words is "one billion, three hundred twenty-one million, eight hundred nineteen thousand, two hundred eighteen".