521211853 has 4 divisors (see below), whose sum is σ = 521341920. Its totient is φ = 521081788.

The previous prime is 521211851. The next prime is 521211869. The reversal of 521211853 is 358112125.

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 521211853 - 2¹ = 521211851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521211851) 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, 58825 + ... + 67102.

It is an arithmetic number, because the mean of its divisors is an integer number (130335480).

Almost surely, 2^521211853 is an apocalyptic number.

It is an amenable number.

521211853 is a deficient number, since it is larger than the sum of its proper divisors (130067).

521211853 is a wasteful number, since it uses less digits than its factorization.

521211853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130066.

The product of its digits is 2400, while the sum is 28.

The square root of 521211853 is about 22830.0646735834. The cubic root of 521211853 is about 804.7693502236.

Adding to 521211853 its reverse (358112125), we get a palindrome (879323978).

The spelling of 521211853 in words is "five hundred twenty-one million, two hundred eleven thousand, eight hundred fifty-three".