1321800803 has 2 divisors, whose sum is σ = 1321800804. Its totient is φ = 1321800802.

The previous prime is 1321800749. The next prime is 1321800829. The reversal of 1321800803 is 3080081231.

It is an a-pointer prime, because the next prime (1321800829) can be obtained adding 1321800803 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321800803 - 2²⁶ = 1254691939 is a prime.

It is a super-2 number, since 2×1321800803² = 3494314725622889618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1321800863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660900401 + 660900402.

It is an arithmetic number, because the mean of its divisors is an integer number (660900402).

Almost surely, 2^1321800803 is an apocalyptic number.

1321800803 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321800803 is an equidigital number, since it uses as much as digits as its factorization.

1321800803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1321800803 is about 36356.5785381408. The cubic root of 1321800803 is about 1097.4599250280.

The spelling of 1321800803 in words is "one billion, three hundred twenty-one million, eight hundred thousand, eight hundred three".