1311221230424 has 64 divisors (see below), whose sum is σ = 2837863242240. Its totient is φ = 556334438400.

The previous prime is 1311221230393. The next prime is 1311221230507. The reversal of 1311221230424 is 4240321221131.

It is a happy number.

It is a super-2 number, since 2×1311221230424² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311221230393 and 1311221230402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20981624 + ... + 21044024.

It is an arithmetic number, because the mean of its divisors is an integer number (44341613160).

Almost surely, 2^{1311221230424} is an apocalyptic number.

1311221230424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311221230424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1418931621120).

1311221230424 is an abundant number, since it is smaller than the sum of its proper divisors (1526642011816).

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

1311221230424 is a wasteful number, since it uses less digits than its factorization.

1311221230424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66160 (or 66156 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 1311221230424 its reverse (4240321221131), we get a palindrome (5551542451555).

The spelling of 1311221230424 in words is "one trillion, three hundred eleven billion, two hundred twenty-one million, two hundred thirty thousand, four hundred twenty-four".