2128929391397 has 2 divisors, whose sum is σ = 2128929391398. Its totient is φ = 2128929391396.

The previous prime is 2128929391313. The next prime is 2128929391409. The reversal of 2128929391397 is 7931939298212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2080304290276 + 48625101121 = 1442326^2 + 220511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2128929391397 is a prime.

It is a super-2 number, since 2×2128929391397² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2128929391307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064464695698 + 1064464695699.

It is an arithmetic number, because the mean of its divisors is an integer number (1064464695699).

Almost surely, 2^{2128929391397} is an apocalyptic number.

It is an amenable number.

2128929391397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128929391397 is an equidigital number, since it uses as much as digits as its factorization.

2128929391397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 65.

The spelling of 2128929391397 in words is "two trillion, one hundred twenty-eight billion, nine hundred twenty-nine million, three hundred ninety-one thousand, three hundred ninety-seven".