521211120 has 80 divisors (see below), whose sum is σ = 1621181952. Its totient is φ = 138522880.

The previous prime is 521211107. The next prime is 521211137. The reversal of 521211120 is 21112125.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×521211120² = 543322063223308800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 521211120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71149 + ... + 78131.

Almost surely, 2^521211120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521211120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (810590976).

521211120 is an abundant number, since it is smaller than the sum of its proper divisors (1099970832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521211120 is a wasteful number, since it uses less digits than its factorization.

521211120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7310 (or 7304 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 521211120 is about 22830.0486201848. The cubic root of 521211120 is about 804.7689729642.

Adding to 521211120 its reverse (21112125), we get a palindrome (542323245).

The spelling of 521211120 in words is "five hundred twenty-one million, two hundred eleven thousand, one hundred twenty".