2013210021 has 4 divisors (see below), whose sum is σ = 2684280032. Its totient is φ = 1342140012.

The previous prime is 2013210013. The next prime is 2013210049. The reversal of 2013210021 is 1200123102.

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 not a de Polignac number, because 2013210021 - 2³ = 2013210013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2013209979 and 2013210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013210821) 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, 335535001 + ... + 335535006.

It is an arithmetic number, because the mean of its divisors is an integer number (671070008).

Almost surely, 2^2013210021 is an apocalyptic number.

It is an amenable number.

2013210021 is a deficient number, since it is larger than the sum of its proper divisors (671070011).

2013210021 is an equidigital number, since it uses as much as digits as its factorization.

2013210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671070010.

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

The square root of 2013210021 is about 44868.8089991254. The cubic root of 2013210021 is about 1262.6888955147.

Adding to 2013210021 its reverse (1200123102), we get a palindrome (3213333123).

The spelling of 2013210021 in words is "two billion, thirteen million, two hundred ten thousand, twenty-one".