7116821 has 8 divisors (see below), whose sum is σ = 7608384. Its totient is φ = 6640480.

The previous prime is 7116799. The next prime is 7116847. The reversal of 7116821 is 1286117.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7116821 - 2¹⁸ = 6854677 is a prime.

It is a super-2 number, since 2×7116821² = 101298282292082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7116871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2831 + ... + 4716.

It is an arithmetic number, because the mean of its divisors is an integer number (951048).

Almost surely, 2^7116821 is an apocalyptic number.

It is an amenable number.

7116821 is a deficient number, since it is larger than the sum of its proper divisors (491563).

7116821 is a wasteful number, since it uses less digits than its factorization.

7116821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7611.

The product of its digits is 672, while the sum is 26.

The square root of 7116821 is about 2667.7370560083. The cubic root of 7116821 is about 192.3513982180.

The spelling of 7116821 in words is "seven million, one hundred sixteen thousand, eight hundred twenty-one".