2145122153117 has 4 divisors (see below), whose sum is σ = 2185596156060. Its totient is φ = 2104648150176.

The previous prime is 2145122153101. The next prime is 2145122153123. The reversal of 2145122153117 is 7113512215412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 709807935001 + 1435314218116 = 842501^2 + 1198046^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145122153117 - 2⁴ = 2145122153101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145122153417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20237001392 + ... + 20237001497.

It is an arithmetic number, because the mean of its divisors is an integer number (546399039015).

Almost surely, 2^{2145122153117} is an apocalyptic number.

It is an amenable number.

2145122153117 is a deficient number, since it is larger than the sum of its proper divisors (40474002943).

2145122153117 is an equidigital number, since it uses as much as digits as its factorization.

2145122153117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40474002942.

The product of its digits is 16800, while the sum is 35.

Adding to 2145122153117 its reverse (7113512215412), we get a palindrome (9258634368529).

The spelling of 2145122153117 in words is "two trillion, one hundred forty-five billion, one hundred twenty-two million, one hundred fifty-three thousand, one hundred seventeen".