2161381130973 has 48 divisors (see below), whose sum is σ = 3350095943040. Its totient is φ = 1377128434176.

The previous prime is 2161381130933. The next prime is 2161381130981. The reversal of 2161381130973 is 3790311831612.

2161381130973 is a `hidden beast` number, since 21 + 613 + 8 + 1 + 1 + 3 + 0 + 9 + 7 + 3 = 666.

It is not a de Polignac number, because 2161381130973 - 2⁸ = 2161381130717 is a prime.

It is a super-2 number, since 2×2161381130973² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161381130933) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17320240 + ... + 17444582.

It is an arithmetic number, because the mean of its divisors is an integer number (69793665480).

Almost surely, 2^{2161381130973} is an apocalyptic number.

2161381130973 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2161381130973 is a deficient number, since it is larger than the sum of its proper divisors (1188714812067).

2161381130973 is a wasteful number, since it uses less digits than its factorization.

2161381130973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125615 (or 125586 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 2161381130973 in words is "two trillion, one hundred sixty-one billion, three hundred eighty-one million, one hundred thirty thousand, nine hundred seventy-three".