2111521 has 4 divisors (see below), whose sum is σ = 2114992. Its totient is φ = 2108052.

The previous prime is 2111513. The next prime is 2111531. The reversal of 2111521 is 1251112.

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 2111521 - 2³ = 2111513 is a prime.

It is a Duffinian number.

2111521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2111531) 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, 555 + ... + 2128.

It is an arithmetic number, because the mean of its divisors is an integer number (528748).

2^2111521 is an apocalyptic number.

It is an amenable number.

2111521 is a deficient number, since it is larger than the sum of its proper divisors (3471).

2111521 is an equidigital number, since it uses as much as digits as its factorization.

2111521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3470.

The product of its digits is 20, while the sum is 13.

The square root of 2111521 is about 1453.1073601080. The cubic root of 2111521 is about 128.2916729150.

Adding to 2111521 its reverse (1251112), we get a palindrome (3362633).

The spelling of 2111521 in words is "two million, one hundred eleven thousand, five hundred twenty-one".