2013815021 has 8 divisors (see below), whose sum is σ = 2102150424. Its totient is φ = 1927264320.

The previous prime is 2013814993. The next prime is 2013815051. The reversal of 2013815021 is 1205183102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 298944100 + 1714870921 = 17290^2 + 41411^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2013815021 - 2¹⁴ = 2013798637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013815051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443870 + ... + 448383.

It is an arithmetic number, because the mean of its divisors is an integer number (262768803).

Almost surely, 2^2013815021 is an apocalyptic number.

It is an amenable number.

2013815021 is a deficient number, since it is larger than the sum of its proper divisors (88335403).

2013815021 is an equidigital number, since it uses as much as digits as its factorization.

2013815021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892351.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2013815021 is about 44875.5503698840. The cubic root of 2013815021 is about 1262.8153685375.

Adding to 2013815021 its reverse (1205183102), we get a palindrome (3218998123).

The spelling of 2013815021 in words is "two billion, thirteen million, eight hundred fifteen thousand, twenty-one".