21062764702789 has 2 divisors, whose sum is σ = 21062764702790. Its totient is φ = 21062764702788.

The previous prime is 21062764702781. The next prime is 21062764702807. The reversal of 21062764702789 is 98720746726012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21061288990564 + 1475712225 = 4589258^2 + 38415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21062764702789 - 2³ = 21062764702781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21062764702781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531382351394 + 10531382351395.

It is an arithmetic number, because the mean of its divisors is an integer number (10531382351395).

Almost surely, 2^{21062764702789} is an apocalyptic number.

It is an amenable number.

21062764702789 is a deficient number, since it is larger than the sum of its proper divisors (1).

21062764702789 is an equidigital number, since it uses as much as digits as its factorization.

21062764702789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28449792, while the sum is 61.

The spelling of 21062764702789 in words is "twenty-one trillion, sixty-two billion, seven hundred sixty-four million, seven hundred two thousand, seven hundred eighty-nine".