2102002021 has 8 divisors (see below), whose sum is σ = 2405467520. Its totient is φ = 1799331408.

The previous prime is 2102002003. The next prime is 2102002033. The reversal of 2102002021 is 1202002012.

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

It is not a de Polignac number, because 2102002021 - 2⁹ = 2102001509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102001989 and 2102002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102002421) 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, 193041 + ... + 203638.

It is an arithmetic number, because the mean of its divisors is an integer number (300683440).

Almost surely, 2^2102002021 is an apocalyptic number.

It is an amenable number.

2102002021 is a deficient number, since it is larger than the sum of its proper divisors (303465499).

2102002021 is an equidigital number, since it uses as much as digits as its factorization.

2102002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397443.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2102002021 is about 45847.5955858102. The cubic root of 2102002021 is about 1280.9859796068.

Adding to 2102002021 its reverse (1202002012), we get a palindrome (3304004033).

Subtracting from 2102002021 its reverse (1202002012), we obtain a palindrome (900000009).

The spelling of 2102002021 in words is "two billion, one hundred two million, two thousand, twenty-one".