1321816802 has 4 divisors (see below), whose sum is σ = 1982725206. Its totient is φ = 660908400.

The previous prime is 1321816801. The next prime is 1321816807. The reversal of 1321816802 is 2086181231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1309064761 + 12752041 = 36181^2 + 3571^2 .

It is not an unprimeable number, because it can be changed into a prime (1321816801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330454199 + ... + 330454202.

Almost surely, 2^1321816802 is an apocalyptic number.

1321816802 is a deficient number, since it is larger than the sum of its proper divisors (660908404).

1321816802 is an equidigital number, since it uses as much as digits as its factorization.

1321816802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660908403.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1321816802 is about 36356.7985664305. The cubic root of 1321816802 is about 1097.4643528738.

The spelling of 1321816802 in words is "one billion, three hundred twenty-one million, eight hundred sixteen thousand, eight hundred two".