7042171421 has 2 divisors, whose sum is σ = 7042171422. Its totient is φ = 7042171420.

The previous prime is 7042171403. The next prime is 7042171429. The reversal of 7042171421 is 1241712407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6466411396 + 575760025 = 80414^2 + 23995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7042171421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7042171429) 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, 3521085710 + 3521085711.

It is an arithmetic number, because the mean of its divisors is an integer number (3521085711).

Almost surely, 2^7042171421 is an apocalyptic number.

It is an amenable number.

7042171421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7042171421 is an equidigital number, since it uses as much as digits as its factorization.

7042171421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 7042171421 is about 83917.6466602824. The cubic root of 7042171421 is about 1916.7649716166.

Adding to 7042171421 its reverse (1241712407), we get a palindrome (8283883828).

The spelling of 7042171421 in words is "seven billion, forty-two million, one hundred seventy-one thousand, four hundred twenty-one".