21084354713 has 2 divisors, whose sum is σ = 21084354714. Its totient is φ = 21084354712.

The previous prime is 21084354671. The next prime is 21084354761. The reversal of 21084354713 is 31745348012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11506209289 + 9578145424 = 107267^2 + 97868^2 .

It is a cyclic number.

It is not a de Polignac number, because 21084354713 - 2¹⁴ = 21084338329 is a prime.

It is not a weakly prime, because it can be changed into another prime (21084354773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10542177356 + 10542177357.

It is an arithmetic number, because the mean of its divisors is an integer number (10542177357).

Almost surely, 2^21084354713 is an apocalyptic number.

It is an amenable number.

21084354713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21084354713 is an equidigital number, since it uses as much as digits as its factorization.

21084354713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 21084354713 in words is "twenty-one billion, eighty-four million, three hundred fifty-four thousand, seven hundred thirteen".