71366021 has 4 divisors (see below), whose sum is σ = 71686272. Its totient is φ = 71045772.

The previous prime is 71366011. The next prime is 71366039. The reversal of 71366021 is 12066317.

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: 12066317 = 751 ⋅16067.

It is a cyclic number.

It is not a de Polignac number, because 71366021 - 2¹⁴ = 71349637 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 (71366011) 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, 159791 + ... + 160236.

It is an arithmetic number, because the mean of its divisors is an integer number (17921568).

Almost surely, 2^71366021 is an apocalyptic number.

It is an amenable number.

71366021 is a deficient number, since it is larger than the sum of its proper divisors (320251).

71366021 is a wasteful number, since it uses less digits than its factorization.

71366021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320250.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 71366021 is about 8447.8412035265. The cubic root of 71366021 is about 414.7921173001.

The spelling of 71366021 in words is "seventy-one million, three hundred sixty-six thousand, twenty-one".