2161425231113 has 4 divisors (see below), whose sum is σ = 2182825481028. Its totient is φ = 2140024981200.

The previous prime is 2161425231103. The next prime is 2161425231137. The reversal of 2161425231113 is 3111325241612.

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 2078980445689 + 82444785424 = 1441867^2 + 287132^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161425231113 - 2⁸ = 2161425230857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161425231113.

It is not an unprimeable number, because it can be changed into a prime (2161425231103) 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, 10700124806 + ... + 10700125007.

It is an arithmetic number, because the mean of its divisors is an integer number (545706370257).

Almost surely, 2^{2161425231113} is an apocalyptic number.

It is an amenable number.

2161425231113 is a deficient number, since it is larger than the sum of its proper divisors (21400249915).

2161425231113 is a wasteful number, since it uses less digits than its factorization.

2161425231113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21400249914.

The product of its digits is 8640, while the sum is 32.

The spelling of 2161425231113 in words is "two trillion, one hundred sixty-one billion, four hundred twenty-five million, two hundred thirty-one thousand, one hundred thirteen".