10002001221021 has 4 divisors (see below), whose sum is σ = 13336001628032. Its totient is φ = 6668000814012.

The previous prime is 10002001220941. The next prime is 10002001221031. The reversal of 10002001221021 is 12012210020001.

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 not a de Polignac number, because 10002001221021 - 2¹⁹ = 10002000696733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10002001220988 and 10002001221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10002001221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667000203501 + ... + 1667000203506.

It is an arithmetic number, because the mean of its divisors is an integer number (3334000407008).

Almost surely, 2^{10002001221021} is an apocalyptic number.

It is an amenable number.

10002001221021 is a deficient number, since it is larger than the sum of its proper divisors (3334000407011).

10002001221021 is an equidigital number, since it uses as much as digits as its factorization.

10002001221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334000407010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 10002001221021 its reverse (12012210020001), we get a palindrome (22014211241022).

The spelling of 10002001221021 in words is "ten trillion, two billion, one million, two hundred twenty-one thousand, twenty-one".