21404535013 has 2 divisors, whose sum is σ = 21404535014. Its totient is φ = 21404535012.

The previous prime is 21404534993. The next prime is 21404535023. The reversal of 21404535013 is 31053540412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20438133444 + 966401569 = 142962^2 + 31087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21404535013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404535023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702267506 + 10702267507.

It is an arithmetic number, because the mean of its divisors is an integer number (10702267507).

Almost surely, 2^21404535013 is an apocalyptic number.

It is an amenable number.

21404535013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404535013 is an equidigital number, since it uses as much as digits as its factorization.

21404535013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21404535013 in words is "twenty-one billion, four hundred four million, five hundred thirty-five thousand, thirteen".