7152821 has 8 divisors (see below), whose sum is σ = 7969080. Its totient is φ = 6374592.

The previous prime is 7152791. The next prime is 7152823. The reversal of 7152821 is 1282517.

It can be written as a sum of positive squares in 4 ways, for example, as 130321 + 7022500 = 361^2 + 2650^2 .

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 7152821 - 2¹⁰ = 7151797 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 (7152823) 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, 9110 + ... + 9863.

It is an arithmetic number, because the mean of its divisors is an integer number (996135).

Almost surely, 2^7152821 is an apocalyptic number.

It is an amenable number.

7152821 is a deficient number, since it is larger than the sum of its proper divisors (816259).

7152821 is a wasteful number, since it uses less digits than its factorization.

7152821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19015.

The product of its digits is 1120, while the sum is 26.

The square root of 7152821 is about 2674.4758364958. The cubic root of 7152821 is about 192.6751854382.

The spelling of 7152821 in words is "seven million, one hundred fifty-two thousand, eight hundred twenty-one".