7181421 has 16 divisors (see below), whose sum is σ = 10489920. Its totient is φ = 4343040.

The previous prime is 7181399. The next prime is 7181423. The reversal of 7181421 is 1241817.

It is not a de Polignac number, because 7181421 - 2⁹ = 7180909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7181391 and 7181400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7181423) 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 15 ways as a sum of consecutive naturals, for example, 741 + ... + 3861.

It is an arithmetic number, because the mean of its divisors is an integer number (655620).

Almost surely, 2^7181421 is an apocalyptic number.

It is an amenable number.

7181421 is a deficient number, since it is larger than the sum of its proper divisors (3308499).

7181421 is a wasteful number, since it uses less digits than its factorization.

7181421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196.

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

The square root of 7181421 is about 2679.8173445218. The cubic root of 7181421 is about 192.9316428613.

The spelling of 7181421 in words is "seven million, one hundred eighty-one thousand, four hundred twenty-one".