1002000100021 has 4 divisors (see below), whose sum is σ = 1005992132544. Its totient is φ = 998008067500.

The previous prime is 1002000100019. The next prime is 1002000100027. The reversal of 1002000100021 is 1200010002001.

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 not a de Polignac number, because 1002000100021 - 2¹ = 1002000100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002000099977 and 1002000100013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002000100027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1996015885 + ... + 1996016386.

It is an arithmetic number, because the mean of its divisors is an integer number (251498033136).

Almost surely, 2^{1002000100021} is an apocalyptic number.

It is an amenable number.

1002000100021 is a deficient number, since it is larger than the sum of its proper divisors (3992032523).

1002000100021 is an equidigital number, since it uses as much as digits as its factorization.

1002000100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992032522.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1002000100021 its reverse (1200010002001), we get a palindrome (2202010102022).

The spelling of 1002000100021 in words is "one trillion, two billion, one hundred thousand, twenty-one".