7066421 has 4 divisors (see below), whose sum is σ = 7105644. Its totient is φ = 7027200.

The previous prime is 7066399. The next prime is 7066429. The reversal of 7066421 is 1246607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1246607 = 433 ⋅2879.

It can be written as a sum of positive squares in 2 ways, for example, as 3010225 + 4056196 = 1735^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 7066421 - 2¹⁴ = 7050037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7066429) 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, 19340 + ... + 19701.

It is an arithmetic number, because the mean of its divisors is an integer number (1776411).

Almost surely, 2^7066421 is an apocalyptic number.

It is an amenable number.

7066421 is a deficient number, since it is larger than the sum of its proper divisors (39223).

7066421 is a wasteful number, since it uses less digits than its factorization.

7066421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39222.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 7066421 is about 2658.2740641251. The cubic root of 7066421 is about 191.8962565267.

The spelling of 7066421 in words is "seven million, sixty-six thousand, four hundred twenty-one".