7007521 has 4 divisors (see below), whose sum is σ = 7040944. Its totient is φ = 6974100.

The previous prime is 7007509. The next prime is 7007527. The reversal of 7007521 is 1257007.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1257007 = 953 ⋅1319.

It is a cyclic number.

It is not a de Polignac number, because 7007521 - 2¹⁹ = 6483233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7007492 and 7007501.

It is not an unprimeable number, because it can be changed into a prime (7007527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16395 + ... + 16816.

It is an arithmetic number, because the mean of its divisors is an integer number (1760236).

Almost surely, 2^7007521 is an apocalyptic number.

It is an amenable number.

7007521 is a deficient number, since it is larger than the sum of its proper divisors (33423).

7007521 is a wasteful number, since it uses less digits than its factorization.

7007521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33422.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 7007521 is about 2647.1722648895. The cubic root of 7007521 is about 191.3616040193.

The spelling of 7007521 in words is "seven million, seven thousand, five hundred twenty-one".