1242403121523 has 8 divisors (see below), whose sum is σ = 1656545688000. Its totient is φ = 828264651368.

The previous prime is 1242403121513. The next prime is 1242403121527. The reversal of 1242403121523 is 3251213042421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242403121523 - 2¹⁶ = 1242403055987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242403121527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227973 + ... + 1592726.

It is an arithmetic number, because the mean of its divisors is an integer number (207068211000).

Almost surely, 2^{1242403121523} is an apocalyptic number.

1242403121523 is a deficient number, since it is larger than the sum of its proper divisors (414142566477).

1242403121523 is a wasteful number, since it uses less digits than its factorization.

1242403121523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048161.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 1242403121523 its reverse (3251213042421), we get a palindrome (4493616163944).

The spelling of 1242403121523 in words is "one trillion, two hundred forty-two billion, four hundred three million, one hundred twenty-one thousand, five hundred twenty-three".