2175421939 has 2 divisors, whose sum is σ = 2175421940. Its totient is φ = 2175421938.

The previous prime is 2175421883. The next prime is 2175421943. The reversal of 2175421939 is 9391245712.

2175421939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2175421939 - 2¹⁵ = 2175389171 is a prime.

It is a super-2 number, since 2×2175421939² = 9464921225365039442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2175421895 and 2175421904.

It is not a weakly prime, because it can be changed into another prime (2175421139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1087710969 + 1087710970.

It is an arithmetic number, because the mean of its divisors is an integer number (1087710970).

Almost surely, 2^2175421939 is an apocalyptic number.

2175421939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2175421939 is an equidigital number, since it uses as much as digits as its factorization.

2175421939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 2175421939 is about 46641.4187069819. The cubic root of 2175421939 is about 1295.7299619883.

The spelling of 2175421939 in words is "two billion, one hundred seventy-five million, four hundred twenty-one thousand, nine hundred thirty-nine".