1001321120020 has 48 divisors (see below), whose sum is σ = 2383711827840. Its totient is φ = 350259693696.

The previous prime is 1001321120011. The next prime is 1001321120027. The reversal of 1001321120020 is 200211231001.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001321120027) 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 15 ways as a sum of consecutive naturals, for example, 101343352 + ... + 101353231.

It is an arithmetic number, because the mean of its divisors is an integer number (49660663080).

Almost surely, 2^{1001321120020} is an apocalyptic number.

1001321120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001321120020 is an abundant number, since it is smaller than the sum of its proper divisors (1382390707820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001321120020 is a wasteful number, since it uses less digits than its factorization.

1001321120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202696624 (or 202696622 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1001321120020 its reverse (200211231001), we get a palindrome (1201532351021).

The spelling of 1001321120020 in words is "one trillion, one billion, three hundred twenty-one million, one hundred twenty thousand, twenty".