2117323237721 has 2 divisors, whose sum is σ = 2117323237722. Its totient is φ = 2117323237720.

The previous prime is 2117323237691. The next prime is 2117323237739. The reversal of 2117323237721 is 1277323237112.

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., 2105401000000 + 11922237721 = 1451000^2 + 109189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117323237721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2117323237751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058661618860 + 1058661618861.

It is an arithmetic number, because the mean of its divisors is an integer number (1058661618861).

Almost surely, 2^{2117323237721} is an apocalyptic number.

It is an amenable number.

2117323237721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117323237721 is an equidigital number, since it uses as much as digits as its factorization.

2117323237721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 41.

The spelling of 2117323237721 in words is "two trillion, one hundred seventeen billion, three hundred twenty-three million, two hundred thirty-seven thousand, seven hundred twenty-one".