21034505413 has 2 divisors, whose sum is σ = 21034505414. Its totient is φ = 21034505412.

The previous prime is 21034505411. The next prime is 21034505483. The reversal of 21034505413 is 31450543012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19227150244 + 1807355169 = 138662^2 + 42513^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034505413 - 2¹ = 21034505411 is a prime.

Together with 21034505411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21034505411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517252706 + 10517252707.

It is an arithmetic number, because the mean of its divisors is an integer number (10517252707).

Almost surely, 2^21034505413 is an apocalyptic number.

It is an amenable number.

21034505413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034505413 is an equidigital number, since it uses as much as digits as its factorization.

21034505413 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 21034505413 in words is "twenty-one billion, thirty-four million, five hundred five thousand, four hundred thirteen".