21114700720709 has 2 divisors, whose sum is σ = 21114700720710. Its totient is φ = 21114700720708.

The previous prime is 21114700720667. The next prime is 21114700720733. The reversal of 21114700720709 is 90702700741112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21101592760609 + 13107960100 = 4593647^2 + 114490^2 .

It is a cyclic number.

It is not a de Polignac number, because 21114700720709 - 2²⁰ = 21114699672133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21114700720409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557350360354 + 10557350360355.

It is an arithmetic number, because the mean of its divisors is an integer number (10557350360355).

Almost surely, 2^{21114700720709} is an apocalyptic number.

It is an amenable number.

21114700720709 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114700720709 is an equidigital number, since it uses as much as digits as its factorization.

21114700720709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 41.

The spelling of 21114700720709 in words is "twenty-one trillion, one hundred fourteen billion, seven hundred million, seven hundred twenty thousand, seven hundred nine".