71421140221 has 4 divisors (see below), whose sum is σ = 71466259392. Its totient is φ = 71376021052.

The previous prime is 71421140177. The next prime is 71421140233. The reversal of 71421140221 is 12204112417.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71421140221 - 2¹⁵ = 71421107453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71421140621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22557211 + ... + 22560376.

It is an arithmetic number, because the mean of its divisors is an integer number (17866564848).

Almost surely, 2^71421140221 is an apocalyptic number.

It is an amenable number.

71421140221 is a deficient number, since it is larger than the sum of its proper divisors (45119171).

71421140221 is a wasteful number, since it uses less digits than its factorization.

71421140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45119170.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 71421140221 its reverse (12204112417), we get a palindrome (83625252638).

The spelling of 71421140221 in words is "seventy-one billion, four hundred twenty-one million, one hundred forty thousand, two hundred twenty-one".