20121345173 has 8 divisors (see below), whose sum is σ = 21374680800. Its totient is φ = 18887441328.

The previous prime is 20121345157. The next prime is 20121345229. The reversal of 20121345173 is 37154312102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121345173 - 2⁴ = 20121345157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121345103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4855811 + ... + 4859952.

It is an arithmetic number, because the mean of its divisors is an integer number (2671835100).

Almost surely, 2^20121345173 is an apocalyptic number.

It is an amenable number.

20121345173 is a deficient number, since it is larger than the sum of its proper divisors (1253335627).

20121345173 is a wasteful number, since it uses less digits than its factorization.

20121345173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9715891.

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 20121345173 its reverse (37154312102), we get a palindrome (57275657275).

The spelling of 20121345173 in words is "twenty billion, one hundred twenty-one million, three hundred forty-five thousand, one hundred seventy-three".