7206021 has 6 divisors (see below), whose sum is σ = 10408710. Its totient is φ = 4804008.

The previous prime is 7206019. The next prime is 7206053. The reversal of 7206021 is 1206027.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4601025 + 2604996 = 2145^2 + 1614^2 .

It is not a de Polignac number, because 7206021 - 2¹ = 7206019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7205985 and 7206003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7206821) 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 5 ways as a sum of consecutive naturals, for example, 400326 + ... + 400343.

It is an arithmetic number, because the mean of its divisors is an integer number (1734785).

Almost surely, 2^7206021 is an apocalyptic number.

It is an amenable number.

7206021 is a deficient number, since it is larger than the sum of its proper divisors (3202689).

7206021 is a wasteful number, since it uses less digits than its factorization.

7206021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800675 (or 800672 counting only the distinct ones).

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

The square root of 7206021 is about 2684.4032856484. The cubic root of 7206021 is about 193.1516879573.

The spelling of 7206021 in words is "seven million, two hundred six thousand, twenty-one".