531221531412 has 48 divisors (see below), whose sum is σ = 1456215671232. Its totient is φ = 148593434880.

The previous prime is 531221531377. The next prime is 531221531431. The reversal of 531221531412 is 214135122135.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 531221531412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154783113 + ... + 154786544.

It is an arithmetic number, because the mean of its divisors is an integer number (30337826484).

Almost surely, 2^531221531412 is an apocalyptic number.

531221531412 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

531221531412 is an abundant number, since it is smaller than the sum of its proper divisors (924994139820).

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

531221531412 is a wasteful number, since it uses less digits than its factorization.

531221531412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309569688 (or 309569686 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

Adding to 531221531412 its reverse (214135122135), we get a palindrome (745356653547).

The spelling of 531221531412 in words is "five hundred thirty-one billion, two hundred twenty-one million, five hundred thirty-one thousand, four hundred twelve".