7124421 has 8 divisors (see below), whose sum is σ = 9511744. Its totient is φ = 4743360.

The previous prime is 7124417. The next prime is 7124431. The reversal of 7124421 is 1244217.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7124421 - 2² = 7124417 is a prime.

It is an Ulam number.

It is a Duffinian number.

7124421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7124431) 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 7 ways as a sum of consecutive naturals, for example, 2976 + ... + 4806.

It is an arithmetic number, because the mean of its divisors is an integer number (1188968).

Almost surely, 2^7124421 is an apocalyptic number.

It is an amenable number.

7124421 is a deficient number, since it is larger than the sum of its proper divisors (2387323).

7124421 is a wasteful number, since it uses less digits than its factorization.

7124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131.

The product of its digits is 448, while the sum is 21.

The square root of 7124421 is about 2669.1611041674. The cubic root of 7124421 is about 192.4198440667.

Adding to 7124421 its reverse (1244217), we get a palindrome (8368638).

The spelling of 7124421 in words is "seven million, one hundred twenty-four thousand, four hundred twenty-one".