21301321013 has 24 divisors (see below), whose sum is σ = 24983838720. Its totient is φ = 18107893440.

The previous prime is 21301321009. The next prime is 21301321049. The reversal of 21301321013 is 31012310312.

It is not a de Polignac number, because 21301321013 - 2² = 21301321009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21301320982 and 21301321000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301321003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4158668 + ... + 4163786.

It is an arithmetic number, because the mean of its divisors is an integer number (1040993280).

Almost surely, 2^21301321013 is an apocalyptic number.

It is an amenable number.

21301321013 is a deficient number, since it is larger than the sum of its proper divisors (3682517707).

21301321013 is a wasteful number, since it uses less digits than its factorization.

21301321013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5817 (or 5810 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21301321013 its reverse (31012310312), we get a palindrome (52313631325).

The spelling of 21301321013 in words is "twenty-one billion, three hundred one million, three hundred twenty-one thousand, thirteen".