2175421139 has 2 divisors, whose sum is σ = 2175421140. Its totient is φ = 2175421138.

The previous prime is 2175421117. The next prime is 2175421141. The reversal of 2175421139 is 9311245712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2175421139 - 2¹⁶ = 2175355603 is a prime.

Together with 2175421141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2175421099 and 2175421108.

It is not a weakly prime, because it can be changed into another prime (2175421939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1087710569 + 1087710570.

It is an arithmetic number, because the mean of its divisors is an integer number (1087710570).

Almost surely, 2^2175421139 is an apocalyptic number.

2175421139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2175421139 is an equidigital number, since it uses as much as digits as its factorization.

2175421139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 2175421139 is about 46641.4101309126. The cubic root of 2175421139 is about 1295.7298031556.

The spelling of 2175421139 in words is "two billion, one hundred seventy-five million, four hundred twenty-one thousand, one hundred thirty-nine".