7118421 has 4 divisors (see below), whose sum is σ = 9491232. Its totient is φ = 4745612.

The previous prime is 7118413. The next prime is 7118443. The reversal of 7118421 is 1248117.

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 7118421 - 2³ = 7118413 is a prime.

7118421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7118391 and 7118400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7118411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186401 + ... + 1186406.

It is an arithmetic number, because the mean of its divisors is an integer number (2372808).

Almost surely, 2^7118421 is an apocalyptic number.

It is an amenable number.

7118421 is a deficient number, since it is larger than the sum of its proper divisors (2372811).

7118421 is a wasteful number, since it uses less digits than its factorization.

7118421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372810.

The product of its digits is 448, while the sum is 24.

The square root of 7118421 is about 2668.0369187850. The cubic root of 7118421 is about 192.3658119183.

The spelling of 7118421 in words is "seven million, one hundred eighteen thousand, four hundred twenty-one".