521121 has 4 divisors (see below), whose sum is σ = 694832. Its totient is φ = 347412.

The previous prime is 521119. The next prime is 521137. The reversal of 521121 is 121125.

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 not a de Polignac number, because 521121 - 2¹ = 521119 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 521097 and 521106.

It is not an unprimeable number, because it can be changed into a prime (521161) 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, 86851 + ... + 86856.

It is an arithmetic number, because the mean of its divisors is an integer number (173708).

2⁵²¹¹²¹ is an apocalyptic number.

It is an amenable number.

521121 is a deficient number, since it is larger than the sum of its proper divisors (173711).

521121 is a wasteful number, since it uses less digits than its factorization.

521121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173710.

The product of its digits is 20, while the sum is 12.

The square root of 521121 is about 721.8871102880. The cubic root of 521121 is about 80.4722587435.

Adding to 521121 its reverse (121125), we get a palindrome (642246).

The spelling of 521121 in words is "five hundred twenty-one thousand, one hundred twenty-one".