2121432341173 has 2 divisors, whose sum is σ = 2121432341174. Its totient is φ = 2121432341172.

The previous prime is 2121432341159. The next prime is 2121432341213. The reversal of 2121432341173 is 3711432341212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1981681229284 + 139751111889 = 1407722^2 + 373833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121432341173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121432341153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060716170586 + 1060716170587.

It is an arithmetic number, because the mean of its divisors is an integer number (1060716170587).

Almost surely, 2^{2121432341173} is an apocalyptic number.

It is an amenable number.

2121432341173 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121432341173 is an equidigital number, since it uses as much as digits as its factorization.

2121432341173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

Adding to 2121432341173 its reverse (3711432341212), we get a palindrome (5832864682385).

The spelling of 2121432341173 in words is "two trillion, one hundred twenty-one billion, four hundred thirty-two million, three hundred forty-one thousand, one hundred seventy-three".