21010413513 has 4 divisors (see below), whose sum is σ = 28013884688. Its totient is φ = 14006942340.

The previous prime is 21010413511. The next prime is 21010413517. The reversal of 21010413513 is 31531401012.

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 21010413513 - 2¹ = 21010413511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010413513.

It is not an unprimeable number, because it can be changed into a prime (21010413511) 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, 3501735583 + ... + 3501735588.

It is an arithmetic number, because the mean of its divisors is an integer number (7003471172).

Almost surely, 2^21010413513 is an apocalyptic number.

It is an amenable number.

21010413513 is a deficient number, since it is larger than the sum of its proper divisors (7003471175).

21010413513 is an equidigital number, since it uses as much as digits as its factorization.

21010413513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003471174.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21010413513 its reverse (31531401012), we get a palindrome (52541814525).

The spelling of 21010413513 in words is "twenty-one billion, ten million, four hundred thirteen thousand, five hundred thirteen".