1001020002121 has 4 divisors (see below), whose sum is σ = 1001133724432. Its totient is φ = 1000906279812.

The previous prime is 1001020002097. The next prime is 1001020002167. The reversal of 1001020002121 is 1212000201001.

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 1001020002121 - 2⁹ = 1001020001609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001020002098 and 1001020002107.

It is not an unprimeable number, because it can be changed into a prime (1001020002821) 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, 56847951 + ... + 56865556.

It is an arithmetic number, because the mean of its divisors is an integer number (250283431108).

Almost surely, 2^{1001020002121} is an apocalyptic number.

It is an amenable number.

1001020002121 is a deficient number, since it is larger than the sum of its proper divisors (113722311).

1001020002121 is an equidigital number, since it uses as much as digits as its factorization.

1001020002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113722310.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1001020002121 its reverse (1212000201001), we get a palindrome (2213020203122).

The spelling of 1001020002121 in words is "one trillion, one billion, twenty million, two thousand, one hundred twenty-one".