2104521 has 4 divisors (see below), whose sum is σ = 2806032. Its totient is φ = 1403012.

The previous prime is 2104507. The next prime is 2104541. The reversal of 2104521 is 1254012.

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 2104521 - 2¹⁵ = 2071753 is a prime.

It is a D-number.

2104521 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2104521.

It is not an unprimeable number, because it can be changed into a prime (2104541) 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, 350751 + ... + 350756.

It is an arithmetic number, because the mean of its divisors is an integer number (701508).

2^2104521 is an apocalyptic number.

It is an amenable number.

2104521 is a deficient number, since it is larger than the sum of its proper divisors (701511).

2104521 is an equidigital number, since it uses as much as digits as its factorization.

2104521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701510.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2104521 is about 1450.6967291615. The cubic root of 2104521 is about 128.1497474307.

Adding to 2104521 its reverse (1254012), we get a palindrome (3358533).

The spelling of 2104521 in words is "two million, one hundred four thousand, five hundred twenty-one".