71043421 has 4 divisors (see below), whose sum is σ = 71082144. Its totient is φ = 71004700.

The previous prime is 71043409. The next prime is 71043433. The reversal of 71043421 is 12434017.

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 an interprime number because it is at equal distance from previous prime (71043409) and next prime (71043433).

It is a cyclic number.

It is not a de Polignac number, because 71043421 - 2¹⁷ = 70912349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71043392 and 71043401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71043491) 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, 16465 + ... + 20326.

It is an arithmetic number, because the mean of its divisors is an integer number (17770536).

Almost surely, 2^71043421 is an apocalyptic number.

It is an amenable number.

71043421 is a deficient number, since it is larger than the sum of its proper divisors (38723).

71043421 is a wasteful number, since it uses less digits than its factorization.

71043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38722.

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

The square root of 71043421 is about 8428.7259416830. The cubic root of 71043421 is about 414.1661701569.

Adding to 71043421 its reverse (12434017), we get a palindrome (83477438).

The spelling of 71043421 in words is "seventy-one million, forty-three thousand, four hundred twenty-one".