21003043013 has 8 divisors (see below), whose sum is σ = 21284762688. Its totient is φ = 20722006144.

The previous prime is 21003042979. The next prime is 21003043051. The reversal of 21003043013 is 31034030012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21003043013 - 2²² = 20998848709 is a prime.

It is a super-2 number, since 2×21003043013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003042982 and 21003043000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003043073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108620 + ... + 231957.

It is an arithmetic number, because the mean of its divisors is an integer number (2660595336).

Almost surely, 2^21003043013 is an apocalyptic number.

It is an amenable number.

21003043013 is a deficient number, since it is larger than the sum of its proper divisors (281719675).

21003043013 is an equidigital number, since it uses as much as digits as its factorization.

21003043013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341403.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21003043013 its reverse (31034030012), we get a palindrome (52037073025).

The spelling of 21003043013 in words is "twenty-one billion, three million, forty-three thousand, thirteen".