1330821821 has 16 divisors (see below), whose sum is σ = 1558848000. Its totient is φ = 1135656144.

The previous prime is 1330821797. The next prime is 1330821823. The reversal of 1330821821 is 1281280331.

It is not a de Polignac number, because 1330821821 - 2¹⁰ = 1330820797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1330821823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70076 + ... + 87018.

It is an arithmetic number, because the mean of its divisors is an integer number (97428000).

Almost surely, 2^1330821821 is an apocalyptic number.

It is an amenable number.

1330821821 is a deficient number, since it is larger than the sum of its proper divisors (228026179).

1330821821 is an equidigital number, since it uses as much as digits as its factorization.

1330821821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17193 (or 17179 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1330821821 is about 36480.4306580939. The cubic root of 1330821821 is about 1099.9509126856.

The spelling of 1330821821 in words is "one billion, three hundred thirty million, eight hundred twenty-one thousand, eight hundred twenty-one".