1243243114521 has 12 divisors (see below), whose sum is σ = 1760902590192. Its totient is φ = 780074110528.

The previous prime is 1243243114499. The next prime is 1243243114541. The reversal of 1243243114521 is 1254113423421.

It is not a de Polignac number, because 1243243114521 - 2⁶ = 1243243114457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243243114541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 716979015 + ... + 716980748.

It is an arithmetic number, because the mean of its divisors is an integer number (146741882516).

Almost surely, 2^{1243243114521} is an apocalyptic number.

It is an amenable number.

1243243114521 is a deficient number, since it is larger than the sum of its proper divisors (517659475671).

1243243114521 is a wasteful number, since it uses less digits than its factorization.

1243243114521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433959800 (or 1433959783 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

Adding to 1243243114521 its reverse (1254113423421), we get a palindrome (2497356537942).

The spelling of 1243243114521 in words is "one trillion, two hundred forty-three billion, two hundred forty-three million, one hundred fourteen thousand, five hundred twenty-one".