131212021424 has 80 divisors (see below), whose sum is σ = 280967266944. Its totient is φ = 58862092800.

The previous prime is 131212021411. The next prime is 131212021433. The reversal of 131212021424 is 424120212131.

It is a self number, because there is not a number n which added to its sum of digits gives 131212021424.

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, 15933212 + ... + 15941444.

Almost surely, 2^131212021424 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 131212021424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140483633472).

131212021424 is an abundant number, since it is smaller than the sum of its proper divisors (149755245520).

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

131212021424 is a wasteful number, since it uses less digits than its factorization.

131212021424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426 (or 9420 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 131212021424 its reverse (424120212131), we get a palindrome (555332233555).

The spelling of 131212021424 in words is "one hundred thirty-one billion, two hundred twelve million, twenty-one thousand, four hundred twenty-four".