521212432 has 20 divisors (see below), whose sum is σ = 1087530220. Its totient is φ = 240559488.

The previous prime is 521212429. The next prime is 521212463. The reversal of 521212432 is 234212125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 119771136 + 401441296 = 10944^2 + 20036^2 .

It is a super-3 number, since 3×521212432³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252707 + ... + 1253122.

It is an arithmetic number, because the mean of its divisors is an integer number (54376511).

Almost surely, 2^521212432 is an apocalyptic number.

521212432 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

521212432 is an abundant number, since it is smaller than the sum of its proper divisors (566317788).

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

521212432 is a wasteful number, since it uses less digits than its factorization.

521212432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505850 (or 2505844 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 521212432 is about 22830.0773542273. The cubic root of 521212432 is about 804.7696482222.

Adding to 521212432 its reverse (234212125), we get a palindrome (755424557).

The spelling of 521212432 in words is "five hundred twenty-one million, two hundred twelve thousand, four hundred thirty-two".