1242523013421 has 16 divisors (see below), whose sum is σ = 1660190616000. Its totient is φ = 826602391680.

The previous prime is 1242523013393. The next prime is 1242523013453. The reversal of 1242523013421 is 1243103252421.

It is a happy number.

It is not a de Polignac number, because 1242523013421 - 2⁷ = 1242523013293 is a prime.

It is a super-2 number, since 2×1242523013421² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242523013521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16388761 + ... + 16464401.

It is an arithmetic number, because the mean of its divisors is an integer number (103761913500).

Almost surely, 2^{1242523013421} is an apocalyptic number.

It is an amenable number.

1242523013421 is a deficient number, since it is larger than the sum of its proper divisors (417667602579).

1242523013421 is a wasteful number, since it uses less digits than its factorization.

1242523013421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87116.

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

Adding to 1242523013421 its reverse (1243103252421), we get a palindrome (2485626265842).

The spelling of 1242523013421 in words is "one trillion, two hundred forty-two billion, five hundred twenty-three million, thirteen thousand, four hundred twenty-one".