21034044413 has 2 divisors, whose sum is σ = 21034044414. Its totient is φ = 21034044412.

The previous prime is 21034044379. The next prime is 21034044497. The reversal of 21034044413 is 31444043012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19742217049 + 1291827364 = 140507^2 + 35942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034044413 - 2⁶ = 21034044349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21034040413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517022206 + 10517022207.

It is an arithmetic number, because the mean of its divisors is an integer number (10517022207).

Almost surely, 2^21034044413 is an apocalyptic number.

It is an amenable number.

21034044413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034044413 is an equidigital number, since it uses as much as digits as its factorization.

21034044413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21034044413 its reverse (31444043012), we get a palindrome (52478087425).

The spelling of 21034044413 in words is "twenty-one billion, thirty-four million, forty-four thousand, four hundred thirteen".