1000320320021 has 16 divisors (see below), whose sum is σ = 1141709160960. Its totient is φ = 867548571120.

The previous prime is 1000320320011. The next prime is 1000320320029. The reversal of 1000320320021 is 1200230230001.

It is a happy number.

It is not a de Polignac number, because 1000320320021 - 2³⁸ = 725442413077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000320319978 and 1000320320005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000320320029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5120255 + ... + 5312028.

It is an arithmetic number, because the mean of its divisors is an integer number (71356822560).

Almost surely, 2^{1000320320021} is an apocalyptic number.

1000320320021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1000320320021 is a deficient number, since it is larger than the sum of its proper divisors (141388840939).

1000320320021 is a wasteful number, since it uses less digits than its factorization.

1000320320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10432696.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 1000320320021 its reverse (1200230230001), we get a palindrome (2200550550022).

The spelling of 1000320320021 in words is "one trillion, three hundred twenty million, three hundred twenty thousand, twenty-one".