71442424421 has 2 divisors, whose sum is σ = 71442424422. Its totient is φ = 71442424420.

The previous prime is 71442424411. The next prime is 71442424429. The reversal of 71442424421 is 12442424417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64744802500 + 6697621921 = 254450^2 + 81839^2 .

It is a cyclic number.

It is not a de Polignac number, because 71442424421 - 2⁶ = 71442424357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71442424429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35721212210 + 35721212211.

It is an arithmetic number, because the mean of its divisors is an integer number (35721212211).

Almost surely, 2^71442424421 is an apocalyptic number.

It is an amenable number.

71442424421 is a deficient number, since it is larger than the sum of its proper divisors (1).

71442424421 is an equidigital number, since it uses as much as digits as its factorization.

71442424421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57344, while the sum is 35.

Adding to 71442424421 its reverse (12442424417), we get a palindrome (83884848838).

The spelling of 71442424421 in words is "seventy-one billion, four hundred forty-two million, four hundred twenty-four thousand, four hundred twenty-one".