2141521 has 4 divisors (see below), whose sum is σ = 2173552. Its totient is φ = 2109492.

The previous prime is 2141519. The next prime is 2141533. The reversal of 2141521 is 1251412.

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 2141521 - 2¹ = 2141519 is a prime.

It is a super-2 number, since 2×2141521² = 9172224386882, which contains 22 as substring.

It is a Duffinian number.

2141521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2141495 and 2141504.

It is not an unprimeable number, because it can be changed into a prime (2141591) 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, 15915 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (543388).

2^2141521 is an apocalyptic number.

It is an amenable number.

2141521 is a deficient number, since it is larger than the sum of its proper divisors (32031).

2141521 is an equidigital number, since it uses as much as digits as its factorization.

2141521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32030.

The product of its digits is 80, while the sum is 16.

The square root of 2141521 is about 1463.3936585895. The cubic root of 2141521 is about 128.8963973969.

Adding to 2141521 its reverse (1251412), we get a palindrome (3392933).

It can be divided in two parts, 2141 and 521, that added together give a palindrome (2662).

The spelling of 2141521 in words is "two million, one hundred forty-one thousand, five hundred twenty-one".