2013021021 has 16 divisors (see below), whose sum is σ = 2929313088. Its totient is φ = 1219478400.

The previous prime is 2013021011. The next prime is 2013021061. The reversal of 2013021021 is 1201203102.

It is not a de Polignac number, because 2013021021 - 2¹³ = 2013012829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2013020988 and 2013021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013021011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71095 + ... + 95291.

It is an arithmetic number, because the mean of its divisors is an integer number (183082068).

Almost surely, 2^2013021021 is an apocalyptic number.

It is an amenable number.

2013021021 is a deficient number, since it is larger than the sum of its proper divisors (916292067).

2013021021 is a wasteful number, since it uses less digits than its factorization.

2013021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26732.

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

The square root of 2013021021 is about 44866.7028095446. The cubic root of 2013021021 is about 1262.6493805664.

Adding to 2013021021 its reverse (1201203102), we get a palindrome (3214224123).

The spelling of 2013021021 in words is "two billion, thirteen million, twenty-one thousand, twenty-one".