71045421 has 4 divisors (see below), whose sum is σ = 94727232. Its totient is φ = 47363612.

The previous prime is 71045357. The next prime is 71045449. The reversal of 71045421 is 12454017.

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 71045421 - 2⁶ = 71045357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71045391 and 71045400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71045461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11840901 + ... + 11840906.

It is an arithmetic number, because the mean of its divisors is an integer number (23681808).

Almost surely, 2^71045421 is an apocalyptic number.

It is an amenable number.

71045421 is a deficient number, since it is larger than the sum of its proper divisors (23681811).

71045421 is a wasteful number, since it uses less digits than its factorization.

71045421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23681810.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 71045421 is about 8428.8445827409. The cubic root of 71045421 is about 414.1700566279.

Adding to 71045421 its reverse (12454017), we get a palindrome (83499438).

The spelling of 71045421 in words is "seventy-one million, forty-five thousand, four hundred twenty-one".