1001045821 has 8 divisors (see below), whose sum is σ = 1020418560. Its totient is φ = 981691152.

The previous prime is 1001045783. The next prime is 1001045839. The reversal of 1001045821 is 1285401001.

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 1001045821 - 2¹¹ = 1001043773 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001045792 and 1001045801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001043821) 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, 175216 + ... + 180838.

It is an arithmetic number, because the mean of its divisors is an integer number (127552320).

Almost surely, 2^1001045821 is an apocalyptic number.

It is an amenable number.

1001045821 is a deficient number, since it is larger than the sum of its proper divisors (19372739).

1001045821 is an equidigital number, since it uses as much as digits as its factorization.

1001045821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9035.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 1001045821 is about 31639.3081624741. The cubic root of 1001045821 is about 1000.3484855437.

Adding to 1001045821 its reverse (1285401001), we get a palindrome (2286446822).

The spelling of 1001045821 in words is "one billion, one million, forty-five thousand, eight hundred twenty-one".