2152521 has 24 divisors (see below), whose sum is σ = 3711840. Its totient is φ = 1229256.

The previous prime is 2152517. The next prime is 2152559. The reversal of 2152521 is 1252512.

It is not a de Polignac number, because 2152521 - 2² = 2152517 is a prime.

2152521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2152494 and 2152503.

It is not an unprimeable number, because it can be changed into a prime (2152511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 510 + ... + 2136.

It is an arithmetic number, because the mean of its divisors is an integer number (154660).

2^2152521 is an apocalyptic number.

2152521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2152521 is a deficient number, since it is larger than the sum of its proper divisors (1559319).

2152521 is a wasteful number, since it uses less digits than its factorization.

2152521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650 (or 1637 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 2152521 is about 1467.1472318755. The cubic root of 2152521 is about 129.1167142722.

Subtracting from 2152521 its reverse (1252512), we obtain a palindrome (900009).

The spelling of 2152521 in words is "two million, one hundred fifty-two thousand, five hundred twenty-one".