7008021 has 12 divisors (see below), whose sum is σ = 10145772. Its totient is φ = 4661376.

The previous prime is 7008019. The next prime is 7008037. The reversal of 7008021 is 1208007.

It can be written as a sum of positive squares in 2 ways, for example, as 5225796 + 1782225 = 2286^2 + 1335^2 .

It is not a de Polignac number, because 7008021 - 2¹ = 7008019 is a prime.

It is a super-2 number, since 2×7008021² = 98224716672882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7007985 and 7008003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7008041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6685 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (845481).

Almost surely, 2^7008021 is an apocalyptic number.

It is an amenable number.

7008021 is a deficient number, since it is larger than the sum of its proper divisors (3137751).

7008021 is a wasteful number, since it uses less digits than its factorization.

7008021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 7008021 is about 2647.2667036020. The cubic root of 7008021 is about 191.3661552497.

The spelling of 7008021 in words is "seven million, eight thousand, twenty-one".