21326560069 has 2 divisors, whose sum is σ = 21326560070. Its totient is φ = 21326560068.

The previous prime is 21326560049. The next prime is 21326560109. The reversal of 21326560069 is 96006562312.

It is an a-pointer prime, because the next prime (21326560109) can be obtained adding 21326560069 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19919935044 + 1406625025 = 141138^2 + 37505^2 .

It is a cyclic number.

It is not a de Polignac number, because 21326560069 - 2⁵ = 21326560037 is a prime.

It is a super-2 number, since 2×21326560069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21326560039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10663280034 + 10663280035.

It is an arithmetic number, because the mean of its divisors is an integer number (10663280035).

Almost surely, 2^21326560069 is an apocalyptic number.

It is an amenable number.

21326560069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21326560069 is an equidigital number, since it uses as much as digits as its factorization.

21326560069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 21326560069 in words is "twenty-one billion, three hundred twenty-six million, five hundred sixty thousand, sixty-nine".