7143021 has 6 divisors (see below), whose sum is σ = 10317710. Its totient is φ = 4762008.

The previous prime is 7143007. The next prime is 7143049. The reversal of 7143021 is 1203417.

It can be written as a sum of positive squares in only one way, i.e., 6687396 + 455625 = 2586^2 + 675^2 .

It is not a de Polignac number, because 7143021 - 2⁶ = 7142957 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7142985 and 7143003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7143001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 396826 + ... + 396843.

Almost surely, 2^7143021 is an apocalyptic number.

It is an amenable number.

7143021 is a deficient number, since it is larger than the sum of its proper divisors (3174689).

7143021 is a wasteful number, since it uses less digits than its factorization.

7143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793675 (or 793672 counting only the distinct ones).

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

The square root of 7143021 is about 2672.6430738129. The cubic root of 7143021 is about 192.5871511826.

Adding to 7143021 its reverse (1203417), we get a palindrome (8346438).

The spelling of 7143021 in words is "seven million, one hundred forty-three thousand, twenty-one".