531135221234212 has 24 divisors (see below), whose sum is σ = 1062273862039040. Its totient is φ = 227628647763840.

The previous prime is 531135221234207. The next prime is 531135221234347. The reversal of 531135221234212 is 212432122531135.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21633012 + ... + 39118507.

Almost surely, 2^{531135221234212} is an apocalyptic number.

It is an amenable number.

531135221234212 is an abundant number, since it is smaller than the sum of its proper divisors (531138640804828).

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

531135221234212 is a wasteful number, since it uses less digits than its factorization.

531135221234212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61063771 (or 61063769 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

Adding to 531135221234212 its reverse (212432122531135), we get a palindrome (743567343765347).

The spelling of 531135221234212 in words is "five hundred thirty-one trillion, one hundred thirty-five billion, two hundred twenty-one million, two hundred thirty-four thousand, two hundred twelve".