5211521 has 4 divisors (see below), whose sum is σ = 5956032. Its totient is φ = 4467012.

The previous prime is 5211509. The next prime is 5211523. The reversal of 5211521 is 1251125.

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 5211521 - 2⁶ = 5211457 is a prime.

It is a super-2 number, since 2×5211521² = 54319902266882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 5211521.

It is not an unprimeable number, because it can be changed into a prime (5211523) 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, 372245 + ... + 372258.

It is an arithmetic number, because the mean of its divisors is an integer number (1489008).

Almost surely, 2^5211521 is an apocalyptic number.

It is an amenable number.

5211521 is a deficient number, since it is larger than the sum of its proper divisors (744511).

5211521 is an equidigital number, since it uses as much as digits as its factorization.

5211521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744510.

The product of its digits is 100, while the sum is 17.

The square root of 5211521 is about 2282.8755988884. The cubic root of 5211521 is about 173.3756746496.

Adding to 5211521 its reverse (1251125), we get a palindrome (6462646).

The spelling of 5211521 in words is "five million, two hundred eleven thousand, five hundred twenty-one".