2100521 has 8 divisors (see below), whose sum is σ = 2206464. Its totient is φ = 1995840.

The previous prime is 2100493. The next prime is 2100523. The reversal of 2100521 is 1250012.

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 2100521 - 2¹⁰ = 2099497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6065 + ... + 6401.

It is an arithmetic number, because the mean of its divisors is an integer number (275808).

2^2100521 is an apocalyptic number.

It is an amenable number.

2100521 is a deficient number, since it is larger than the sum of its proper divisors (105943).

2100521 is a wasteful number, since it uses less digits than its factorization.

2100521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 2100521 is about 1449.3174255490. The cubic root of 2100521 is about 128.0685058095.

Adding to 2100521 its reverse (1250012), we get a palindrome (3350533).

The spelling of 2100521 in words is "two million, one hundred thousand, five hundred twenty-one".