2102000021 has 12 divisors (see below), whose sum is σ = 2349631200. Its totient is φ = 1878514440.

The previous prime is 2102000009. The next prime is 2102000023. The reversal of 2102000021 is 1200002012.

It is a de Polignac number, because none of the positive numbers 2^k-2102000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101999972 and 2102000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102000023) 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 11 ways as a sum of consecutive naturals, for example, 140081 + ... + 154358.

It is an arithmetic number, because the mean of its divisors is an integer number (195802600).

Almost surely, 2^2102000021 is an apocalyptic number.

It is an amenable number.

2102000021 is a deficient number, since it is larger than the sum of its proper divisors (247631179).

2102000021 is a wasteful number, since it uses less digits than its factorization.

2102000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294520 (or 294509 counting only the distinct ones).

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

The square root of 2102000021 is about 45847.5737744104. The cubic root of 2102000021 is about 1280.9855733318.

Adding to 2102000021 its reverse (1200002012), we get a palindrome (3302002033).

The spelling of 2102000021 in words is "two billion, one hundred two million, twenty-one", and thus it is an aban number.