13221812069 has 2 divisors, whose sum is σ = 13221812070. Its totient is φ = 13221812068.

The previous prime is 13221812063. The next prime is 13221812099. The reversal of 13221812069 is 96021812231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8707315969 + 4514496100 = 93313^2 + 67190^2 .

It is an emirp because it is prime and its reverse (96021812231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13221812069 is a prime.

It is a super-2 number, since 2×13221812069² (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 (13221812063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610906034 + 6610906035.

It is an arithmetic number, because the mean of its divisors is an integer number (6610906035).

Almost surely, 2^13221812069 is an apocalyptic number.

It is an amenable number.

13221812069 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221812069 is an equidigital number, since it uses as much as digits as its factorization.

13221812069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 13221812069 in words is "thirteen billion, two hundred twenty-one million, eight hundred twelve thousand, sixty-nine".