2097521 has 4 divisors (see below), whose sum is σ = 2117232. Its totient is φ = 2077812.

The previous prime is 2097517. The next prime is 2097523. The reversal of 2097521 is 1257902.

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.

It is a cyclic number.

It is not a de Polignac number, because 2097521 - 2² = 2097517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2097523) 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, 9695 + ... + 9908.

It is an arithmetic number, because the mean of its divisors is an integer number (529308).

2^2097521 is an apocalyptic number.

It is an amenable number.

2097521 is a deficient number, since it is larger than the sum of its proper divisors (19711).

2097521 is a wasteful number, since it uses less digits than its factorization.

2097521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19710.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 2097521 is about 1448.2820857830. The cubic root of 2097521 is about 128.0075068839.

The spelling of 2097521 in words is "two million, ninety-seven thousand, five hundred twenty-one".