29161821217 has 2 divisors, whose sum is σ = 29161821218. Its totient is φ = 29161821216.

The previous prime is 29161821197. The next prime is 29161821287. The reversal of 29161821217 is 71212816192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28064290576 + 1097530641 = 167524^2 + 33129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29161821217 is a prime.

It is a super-2 number, since 2×29161821217² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 29161821217.

It is not a weakly prime, because it can be changed into another prime (29161821287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14580910608 + 14580910609.

It is an arithmetic number, because the mean of its divisors is an integer number (14580910609).

Almost surely, 2^29161821217 is an apocalyptic number.

It is an amenable number.

29161821217 is a deficient number, since it is larger than the sum of its proper divisors (1).

29161821217 is an equidigital number, since it uses as much as digits as its factorization.

29161821217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The spelling of 29161821217 in words is "twenty-nine billion, one hundred sixty-one million, eight hundred twenty-one thousand, two hundred seventeen".