21004410013 has 2 divisors, whose sum is σ = 21004410014. Its totient is φ = 21004410012.

The previous prime is 21004409977. The next prime is 21004410041. The reversal of 21004410013 is 31001440012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12070757689 + 8933652324 = 109867^2 + 94518^2 .

It is a cyclic number.

It is not a de Polignac number, because 21004410013 - 2³³ = 12414475421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004410043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502205006 + 10502205007.

It is an arithmetic number, because the mean of its divisors is an integer number (10502205007).

Almost surely, 2^21004410013 is an apocalyptic number.

It is an amenable number.

21004410013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004410013 is an equidigital number, since it uses as much as digits as its factorization.

21004410013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21004410013 its reverse (31001440012), we get a palindrome (52005850025).

The spelling of 21004410013 in words is "twenty-one billion, four million, four hundred ten thousand, thirteen".