2150521 has 4 divisors (see below), whose sum is σ = 2153844. Its totient is φ = 2147200.

The previous prime is 2150513. The next prime is 2150527. The reversal of 2150521 is 1250512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287296 + 1863225 = 536^2 + 1365^2 .

It is a cyclic number.

It is not a de Polignac number, because 2150521 - 2³ = 2150513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2150495 and 2150504.

It is not an unprimeable number, because it can be changed into a prime (2150527) 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, 340 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (538461).

2^2150521 is an apocalyptic number.

It is an amenable number.

2150521 is a deficient number, since it is larger than the sum of its proper divisors (3323).

2150521 is an equidigital number, since it uses as much as digits as its factorization.

2150521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 2150521 is about 1466.4654786254. The cubic root of 2150521 is about 129.0767125798.

Subtracting from 2150521 its reverse (1250512), we obtain a palindrome (900009).

The spelling of 2150521 in words is "two million, one hundred fifty thousand, five hundred twenty-one".