21400131424123 has 16 divisors (see below), whose sum is σ = 23108976009216. Its totient is φ = 19759480377120.

The previous prime is 21400131424109. The next prime is 21400131424157. The reversal of 21400131424123 is 32142413100412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21400131424123 - 2²¹ = 21400129326971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21400131424091 and 21400131424100.

It is not an unprimeable number, because it can be changed into a prime (21400131224123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37518211 + ... + 38084332.

It is an arithmetic number, because the mean of its divisors is an integer number (1444311000576).

Almost surely, 2^{21400131424123} is an apocalyptic number.

21400131424123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21400131424123 is a deficient number, since it is larger than the sum of its proper divisors (1708844585093).

21400131424123 is a wasteful number, since it uses less digits than its factorization.

21400131424123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75602994.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21400131424123 its reverse (32142413100412), we get a palindrome (53542544524535).

The spelling of 21400131424123 in words is "twenty-one trillion, four hundred billion, one hundred thirty-one million, four hundred twenty-four thousand, one hundred twenty-three".