21303121424123 has 16 divisors (see below), whose sum is σ = 26560781072640. Its totient is φ = 16599181581600.

The previous prime is 21303121424113. The next prime is 21303121424131. The reversal of 21303121424123 is 32142412130312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21303121424123 - 2¹⁸ = 21303121161979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303121424113) 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 15 ways as a sum of consecutive naturals, for example, 3470273 + ... + 7392498.

It is an arithmetic number, because the mean of its divisors is an integer number (1660048817040).

Almost surely, 2^{21303121424123} is an apocalyptic number.

21303121424123 is a deficient number, since it is larger than the sum of its proper divisors (5257659648517).

21303121424123 is a wasteful number, since it uses less digits than its factorization.

21303121424123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10888258.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 21303121424123 its reverse (32142412130312), we get a palindrome (53445533554435).

The spelling of 21303121424123 in words is "twenty-one trillion, three hundred three billion, one hundred twenty-one million, four hundred twenty-four thousand, one hundred twenty-three".