7214821 has 4 divisors (see below), whose sum is σ = 7228332. Its totient is φ = 7201312.

The previous prime is 7214791. The next prime is 7214843. The reversal of 7214821 is 1284127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1284127 = 13 ⋅98779.

It can be written as a sum of positive squares in 2 ways, for example, as 656100 + 6558721 = 810^2 + 2561^2 .

It is a cyclic number.

It is not a de Polignac number, because 7214821 - 2¹¹ = 7212773 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7214861) 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, 5920 + ... + 7033.

It is an arithmetic number, because the mean of its divisors is an integer number (1807083).

Almost surely, 2^7214821 is an apocalyptic number.

It is an amenable number.

7214821 is a deficient number, since it is larger than the sum of its proper divisors (13511).

7214821 is a wasteful number, since it uses less digits than its factorization.

7214821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13510.

The product of its digits is 896, while the sum is 25.

The square root of 7214821 is about 2686.0418835156. The cubic root of 7214821 is about 193.2302816508.

Adding to 7214821 its reverse (1284127), we get a palindrome (8498948).

The spelling of 7214821 in words is "seven million, two hundred fourteen thousand, eight hundred twenty-one".