1321816814 has 16 divisors (see below), whose sum is σ = 2131488000. Its totient is φ = 612801144.

The previous prime is 1321816807. The next prime is 1321816817. The reversal of 1321816814 is 4186181231.

It is a super-2 number, since 2×1321816814² = 3494399379546221192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321816817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368264 + ... + 371835.

It is an arithmetic number, because the mean of its divisors is an integer number (133218000).

Almost surely, 2^1321816814 is an apocalyptic number.

1321816814 is a deficient number, since it is larger than the sum of its proper divisors (809671186).

1321816814 is a wasteful number, since it uses less digits than its factorization.

1321816814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740167.

The product of its digits is 9216, while the sum is 35.

The square root of 1321816814 is about 36356.7987314615. The cubic root of 1321816814 is about 1097.4643561949.

The spelling of 1321816814 in words is "one billion, three hundred twenty-one million, eight hundred sixteen thousand, eight hundred fourteen".