2103210021 has 24 divisors (see below), whose sum is σ = 3098142432. Its totient is φ = 1268159200.

The previous prime is 2103210013. The next prime is 2103210071. The reversal of 2103210021 is 1200123012.

It is not a de Polignac number, because 2103210021 - 2³ = 2103210013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2103209979 and 2103210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103210071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56806 + ... + 86216.

It is an arithmetic number, because the mean of its divisors is an integer number (129089268).

Almost surely, 2^2103210021 is an apocalyptic number.

It is an amenable number.

2103210021 is a deficient number, since it is larger than the sum of its proper divisors (994932411).

2103210021 is a wasteful number, since it uses less digits than its factorization.

2103210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29633 (or 29622 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2103210021 is about 45860.7677759542. The cubic root of 2103210021 is about 1281.2313226514.

Adding to 2103210021 its reverse (1200123012), we get a palindrome (3303333033).

The spelling of 2103210021 in words is "two billion, one hundred three million, two hundred ten thousand, twenty-one".