7143421 has 2 divisors, whose sum is σ = 7143422. Its totient is φ = 7143420.

The previous prime is 7143419. The next prime is 7143439. The reversal of 7143421 is 1243417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7080921 + 62500 = 2661^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 7143421 - 2¹ = 7143419 is a prime.

Together with 7143419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 7143392 and 7143401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7143401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3571710 + 3571711.

It is an arithmetic number, because the mean of its divisors is an integer number (3571711).

Almost surely, 2^7143421 is an apocalyptic number.

It is an amenable number.

7143421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7143421 is an equidigital number, since it uses as much as digits as its factorization.

7143421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 22.

The square root of 7143421 is about 2672.7179050547. The cubic root of 7143421 is about 192.5907459932.

Adding to 7143421 its reverse (1243417), we get a palindrome (8386838).

The spelling of 7143421 in words is "seven million, one hundred forty-three thousand, four hundred twenty-one".