2021013513 has 24 divisors (see below), whose sum is σ = 2958438600. Its totient is φ = 1329318144.

The previous prime is 2021013497. The next prime is 2021013521. The reversal of 2021013513 is 3153101202.

It can be written as a sum of positive squares in 4 ways, for example, as 622851849 + 1398161664 = 24957^2 + 37392^2 .

It is not a de Polignac number, because 2021013513 - 2⁴ = 2021013497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2021013523) 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, 405231 + ... + 410187.

It is an arithmetic number, because the mean of its divisors is an integer number (123268275).

Almost surely, 2^2021013513 is an apocalyptic number.

It is an amenable number.

2021013513 is a deficient number, since it is larger than the sum of its proper divisors (937425087).

2021013513 is a wasteful number, since it uses less digits than its factorization.

2021013513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561 (or 5558 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 2021013513 is about 44955.6838786821. The cubic root of 2021013513 is about 1264.3182467983.

Adding to 2021013513 its reverse (3153101202), we get a palindrome (5174114715).

The spelling of 2021013513 in words is "two billion, twenty-one million, thirteen thousand, five hundred thirteen".