2102002001021 has 8 divisors (see below), whose sum is σ = 2266923708504. Its totient is φ = 1937541614400.

The previous prime is 2102002000957. The next prime is 2102002001039. The reversal of 2102002001021 is 1201002002012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 752710672921 + 1349291328100 = 867589^2 + 1161590^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2102002001021 - 2⁶ = 2102002000957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102002000993 and 2102002001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102002061021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115320746 + ... + 115338971.

It is an arithmetic number, because the mean of its divisors is an integer number (283365463563).

Almost surely, 2^{2102002001021} is an apocalyptic number.

It is an amenable number.

2102002001021 is a deficient number, since it is larger than the sum of its proper divisors (164921707483).

2102002001021 is a wasteful number, since it uses less digits than its factorization.

2102002001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230660431.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2102002001021 its reverse (1201002002012), we get a palindrome (3303004003033).

Subtracting from 2102002001021 its reverse (1201002002012), we obtain a palindrome (900999999009).

The spelling of 2102002001021 in words is "two trillion, one hundred two billion, two million, one thousand, twenty-one".