1066820321 has 8 divisors (see below), whose sum is σ = 1235925504. Its totient is φ = 901890720.

The previous prime is 1066820317. The next prime is 1066820327. The reversal of 1066820321 is 1230286601.

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

It is a cyclic number.

It is not a de Polignac number, because 1066820321 - 2² = 1066820317 is a prime.

It is a super-2 number, since 2×1066820321² = 2276211194597086082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1066820327) 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, 1043345 + ... + 1044366.

It is an arithmetic number, because the mean of its divisors is an integer number (154490688).

Almost surely, 2^1066820321 is an apocalyptic number.

It is an amenable number.

1066820321 is a deficient number, since it is larger than the sum of its proper divisors (169105183).

1066820321 is an equidigital number, since it uses as much as digits as its factorization.

1066820321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087791.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1066820321 is about 32662.2154943598. The cubic root of 1066820321 is about 1021.7949686546.

The spelling of 1066820321 in words is "one billion, sixty-six million, eight hundred twenty thousand, three hundred twenty-one".