7198021 has 4 divisors (see below), whose sum is σ = 7621452. Its totient is φ = 6774592.

The previous prime is 7198013. The next prime is 7198039. The reversal of 7198021 is 1208917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1208917 = 71 ⋅17027.

It can be written as a sum of positive squares in 2 ways, for example, as 4669921 + 2528100 = 2161^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 7198021 - 2³ = 7198013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7198421) 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, 211690 + ... + 211723.

It is an arithmetic number, because the mean of its divisors is an integer number (1905363).

Almost surely, 2^7198021 is an apocalyptic number.

It is an amenable number.

7198021 is a deficient number, since it is larger than the sum of its proper divisors (423431).

7198021 is a wasteful number, since it uses less digits than its factorization.

7198021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423430.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 7198021 is about 2682.9127827792. The cubic root of 7198021 is about 193.0801836010.

The spelling of 7198021 in words is "seven million, one hundred ninety-eight thousand, twenty-one".