7009821 has 48 divisors (see below), whose sum is σ = 12964224. Its totient is φ = 3685824.

The previous prime is 7009801. The next prime is 7009823. The reversal of 7009821 is 1289007.

It is not a de Polignac number, because 7009821 - 2⁶ = 7009757 is a prime.

It is a super-3 number, since 3×7009821³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7009823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21955 + ... + 22271.

It is an arithmetic number, because the mean of its divisors is an integer number (270088).

Almost surely, 2^7009821 is an apocalyptic number.

It is an amenable number.

7009821 is a deficient number, since it is larger than the sum of its proper divisors (5954403).

7009821 is a wasteful number, since it uses less digits than its factorization.

7009821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 7009821 is about 2647.6066550755. The cubic root of 7009821 is about 191.3825378867.

The spelling of 7009821 in words is "seven million, nine thousand, eight hundred twenty-one".