2123654223517 has 2 divisors, whose sum is σ = 2123654223518. Its totient is φ = 2123654223516.

The previous prime is 2123654223409. The next prime is 2123654223529. The reversal of 2123654223517 is 7153224563212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2044611150201 + 79043073316 = 1429899^2 + 281146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123654223517 is a prime.

It is a super-2 number, since 2×2123654223517² (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 (2123654223017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061827111758 + 1061827111759.

It is an arithmetic number, because the mean of its divisors is an integer number (1061827111759).

Almost surely, 2^{2123654223517} is an apocalyptic number.

It is an amenable number.

2123654223517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123654223517 is an equidigital number, since it uses as much as digits as its factorization.

2123654223517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 43.

Adding to 2123654223517 its reverse (7153224563212), we get a palindrome (9276878786729).

The spelling of 2123654223517 in words is "two trillion, one hundred twenty-three billion, six hundred fifty-four million, two hundred twenty-three thousand, five hundred seventeen".