1231211520424 has 32 divisors (see below), whose sum is σ = 2330040141000. Its totient is φ = 609869129472.

The previous prime is 1231211520397. The next prime is 1231211520463. The reversal of 1231211520424 is 4240251121321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1169603316324 + 61608204100 = 1081482^2 + 248210^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1231211520392 and 1231211520401.

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, 6099742 + ... + 6298354.

Almost surely, 2^{1231211520424} is an apocalyptic number.

It is an amenable number.

1231211520424 is a deficient number, since it is larger than the sum of its proper divisors (1098828620576).

1231211520424 is a wasteful number, since it uses less digits than its factorization.

1231211520424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205837 (or 205833 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 1231211520424 its reverse (4240251121321), we get a palindrome (5471462641745).

The spelling of 1231211520424 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, five hundred twenty thousand, four hundred twenty-four".