1213530243524 has 24 divisors (see below), whose sum is σ = 2250400635000. Its totient is φ = 570615791616.

The previous prime is 1213530243521. The next prime is 1213530243551. The reversal of 1213530243524 is 4253420353121.

It can be written as a sum of positive squares in 4 ways, for example, as 370659357124 + 842870886400 = 608818^2 + 918080^2 .

It is a super-3 number, since 3×1213530243524³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213530243521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7059197 + ... + 7229060.

It is an arithmetic number, because the mean of its divisors is an integer number (93766693125).

Almost surely, 2^{1213530243524} is an apocalyptic number.

It is an amenable number.

1213530243524 is a deficient number, since it is larger than the sum of its proper divisors (1036870391476).

1213530243524 is a wasteful number, since it uses less digits than its factorization.

1213530243524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14289527 (or 14289525 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 1213530243524 its reverse (4253420353121), we get a palindrome (5466950596645).

The spelling of 1213530243524 in words is "one trillion, two hundred thirteen billion, five hundred thirty million, two hundred forty-three thousand, five hundred twenty-four".