1001022320021 has 4 divisors (see below), whose sum is σ = 1001073771552. Its totient is φ = 1000970868492.

The previous prime is 1001022319967. The next prime is 1001022320047. The reversal of 1001022320021 is 1200232201001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001022320021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001022319978 and 1001022320005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001022320821) 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 3 ways as a sum of consecutive naturals, for example, 25696571 + ... + 25735496.

It is an arithmetic number, because the mean of its divisors is an integer number (250268442888).

Almost surely, 2^{1001022320021} is an apocalyptic number.

It is an amenable number.

1001022320021 is a deficient number, since it is larger than the sum of its proper divisors (51451531).

1001022320021 is an equidigital number, since it uses as much as digits as its factorization.

1001022320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51451530.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1001022320021 its reverse (1200232201001), we get a palindrome (2201254521022).

The spelling of 1001022320021 in words is "one trillion, one billion, twenty-two million, three hundred twenty thousand, twenty-one".