21301033013 has 4 divisors (see below), whose sum is σ = 22939574028. Its totient is φ = 19662492000.

The previous prime is 21301033001. The next prime is 21301033027. The reversal of 21301033013 is 31033010312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4614077329 + 16686955684 = 67927^2 + 129178^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301033013 - 2¹⁰ = 21301031989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21301032982 and 21301033000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301033073) 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, 819270488 + ... + 819270513.

It is an arithmetic number, because the mean of its divisors is an integer number (5734893507).

Almost surely, 2^21301033013 is an apocalyptic number.

It is an amenable number.

21301033013 is a deficient number, since it is larger than the sum of its proper divisors (1638541015).

21301033013 is a wasteful number, since it uses less digits than its factorization.

21301033013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638541014.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21301033013 its reverse (31033010312), we get a palindrome (52334043325).

The spelling of 21301033013 in words is "twenty-one billion, three hundred one million, thirty-three thousand, thirteen".