2175421943 has 2 divisors, whose sum is σ = 2175421944. Its totient is φ = 2175421942.

The previous prime is 2175421939. The next prime is 2175421957. The reversal of 2175421943 is 3491245712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2175421943 - 2² = 2175421939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2175421897 and 2175421906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2175429943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1087710971 + 1087710972.

It is an arithmetic number, because the mean of its divisors is an integer number (1087710972).

Almost surely, 2^2175421943 is an apocalyptic number.

2175421943 is a deficient number, since it is larger than the sum of its proper divisors (1).

2175421943 is an equidigital number, since it uses as much as digits as its factorization.

2175421943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 2175421943 is about 46641.4187498622. The cubic root of 2175421943 is about 1295.7299627824.

The spelling of 2175421943 in words is "two billion, one hundred seventy-five million, four hundred twenty-one thousand, nine hundred forty-three".