521321412 has 12 divisors (see below), whose sum is σ = 1216416656. Its totient is φ = 173773800.

The previous prime is 521321407. The next prime is 521321417. The reversal of 521321412 is 214123125.

It is an interprime number because it is at equal distance from previous prime (521321407) and next prime (521321417).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (521321417) 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, 21721714 + ... + 21721737.

Almost surely, 2^521321412 is an apocalyptic number.

It is an amenable number.

521321412 is an abundant number, since it is smaller than the sum of its proper divisors (695095244).

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

521321412 is a wasteful number, since it uses less digits than its factorization.

521321412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43443458 (or 43443456 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 521321412 is about 22832.4639931830. The cubic root of 521321412 is about 804.8257339171.

Adding to 521321412 its reverse (214123125), we get a palindrome (735444537).

The spelling of 521321412 in words is "five hundred twenty-one million, three hundred twenty-one thousand, four hundred twelve".