71266421 has 4 divisors (see below), whose sum is σ = 71958432. Its totient is φ = 70574412.

The previous prime is 71266411. The next prime is 71266457. The reversal of 71266421 is 12466217.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12466217 = 557 ⋅22381.

It is a cyclic number.

It is not a de Polignac number, because 71266421 - 2¹⁴ = 71250037 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 (71266411) 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, 345851 + ... + 346056.

It is an arithmetic number, because the mean of its divisors is an integer number (17989608).

Almost surely, 2^71266421 is an apocalyptic number.

It is an amenable number.

71266421 is a deficient number, since it is larger than the sum of its proper divisors (692011).

71266421 is a wasteful number, since it uses less digits than its factorization.

71266421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692010.

The product of its digits is 4032, while the sum is 29.

The square root of 71266421 is about 8441.9441481213. The cubic root of 71266421 is about 414.5990631058.

The spelling of 71266421 in words is "seventy-one million, two hundred sixty-six thousand, four hundred twenty-one".