1321816803 has 8 divisors (see below), whose sum is σ = 1788727488. Its totient is φ = 868058664.

The previous prime is 1321816801. The next prime is 1321816807. The reversal of 1321816803 is 3086181231.

1321816803 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1321816803 - 2¹ = 1321816801 is a prime.

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 in 7 ways as a sum of consecutive naturals, for example, 3287901 + ... + 3288302.

It is an arithmetic number, because the mean of its divisors is an integer number (223590936).

Almost surely, 2^1321816803 is an apocalyptic number.

1321816803 is a deficient number, since it is larger than the sum of its proper divisors (466910685).

1321816803 is an equidigital number, since it uses as much as digits as its factorization.

1321816803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6576273.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1321816803 is about 36356.7985801830. The cubic root of 1321816803 is about 1097.4643531506.

The spelling of 1321816803 in words is "one billion, three hundred twenty-one million, eight hundred sixteen thousand, eight hundred three".