7431021 has 20 divisors (see below), whose sum is σ = 11956252. Its totient is φ = 4572288.

The previous prime is 7431019. The next prime is 7431031. The reversal of 7431021 is 1201347.

It can be written as a sum of positive squares in 2 ways, for example, as 5062500 + 2368521 = 2250^2 + 1539^2 .

It is not a de Polignac number, because 7431021 - 2¹ = 7431019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7430985 and 7431003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7431031) 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 19 ways as a sum of consecutive naturals, for example, 2476 + ... + 4581.

Almost surely, 2^7431021 is an apocalyptic number.

It is an amenable number.

7431021 is a deficient number, since it is larger than the sum of its proper divisors (4525231).

7431021 is a wasteful number, since it uses less digits than its factorization.

7431021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7082 (or 7073 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 7431021 is about 2725.9899119402. The cubic root of 7431021 is about 195.1414358516.

Adding to 7431021 its reverse (1201347), we get a palindrome (8632368).

It can be divided in two parts, 743 and 1021, that added together give a square (1764 = 42²).

The spelling of 7431021 in words is "seven million, four hundred thirty-one thousand, twenty-one".