21243123412413 has 128 divisors (see below), whose sum is σ = 33343027052544. Its totient is φ = 11781523353600.

The previous prime is 21243123412409. The next prime is 21243123412451. The reversal of 21243123412413 is 31421432134212.

It is not a de Polignac number, because 21243123412413 - 2² = 21243123412409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243123412013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 21436047348 + ... + 21436048338.

It is an arithmetic number, because the mean of its divisors is an integer number (260492398848).

Almost surely, 2^{21243123412413} is an apocalyptic number.

It is an amenable number.

21243123412413 is a deficient number, since it is larger than the sum of its proper divisors (12099903640131).

21243123412413 is a wasteful number, since it uses less digits than its factorization.

21243123412413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995.

The product of its digits is 27648, while the sum is 33.

Adding to 21243123412413 its reverse (31421432134212), we get a palindrome (52664555546625).

The spelling of 21243123412413 in words is "twenty-one trillion, two hundred forty-three billion, one hundred twenty-three million, four hundred twelve thousand, four hundred thirteen".