21011420013 has 4 divisors (see below), whose sum is σ = 28015226688. Its totient is φ = 14007613340.

The previous prime is 21011419999. The next prime is 21011420021. The reversal of 21011420013 is 31002411012.

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 a cyclic number.

It is not a de Polignac number, because 21011420013 - 2⁸ = 21011419757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011419974 and 21011420001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011420063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3501903333 + ... + 3501903338.

It is an arithmetic number, because the mean of its divisors is an integer number (7003806672).

Almost surely, 2^21011420013 is an apocalyptic number.

It is an amenable number.

21011420013 is a deficient number, since it is larger than the sum of its proper divisors (7003806675).

21011420013 is an equidigital number, since it uses as much as digits as its factorization.

21011420013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003806674.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21011420013 its reverse (31002411012), we get a palindrome (52013831025).

Subtracting 21011420013 from its reverse (31002411012), we obtain a palindrome (9990990999).

The spelling of 21011420013 in words is "twenty-one billion, eleven million, four hundred twenty thousand, thirteen".