21001412424123 has 24 divisors (see below), whose sum is σ = 32166834933168. Its totient is φ = 13158063401472.

The previous prime is 21001412424121. The next prime is 21001412424127. The reversal of 21001412424123 is 32142421410012.

21001412424123 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 1 + 4 + 1 + 242 + 412 + 3 = 666.

It is not a de Polignac number, because 21001412424123 - 2¹ = 21001412424121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001412424121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100381690 + ... + 100590687.

It is an arithmetic number, because the mean of its divisors is an integer number (1340284788882).

Almost surely, 2^{21001412424123} is an apocalyptic number.

21001412424123 is a deficient number, since it is larger than the sum of its proper divisors (11165422509045).

21001412424123 is a wasteful number, since it uses less digits than its factorization.

21001412424123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200973083 (or 200973080 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21001412424123 its reverse (32142421410012), we get a palindrome (53143833834135).

The spelling of 21001412424123 in words is "twenty-one trillion, one billion, four hundred twelve million, four hundred twenty-four thousand, one hundred twenty-three".