521404011 has 24 divisors (see below), whose sum is σ = 774389616. Its totient is φ = 337858560.

The previous prime is 521403989. The next prime is 521404031. The reversal of 521404011 is 110404125.

It is not a de Polignac number, because 521404011 - 2⁵ = 521403979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521404031) 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, 101931 + ... + 106923.

It is an arithmetic number, because the mean of its divisors is an integer number (32266234).

Almost surely, 2^521404011 is an apocalyptic number.

521404011 is a deficient number, since it is larger than the sum of its proper divisors (252985605).

521404011 is a wasteful number, since it uses less digits than its factorization.

521404011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323 (or 5320 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 521404011 is about 22834.2727276347. The cubic root of 521404011 is about 804.8682376321.

Adding to 521404011 its reverse (110404125), we get a palindrome (631808136).

The spelling of 521404011 in words is "five hundred twenty-one million, four hundred four thousand, eleven".