21115321425136 has 20 divisors (see below), whose sum is σ = 40911030832000. Its totient is φ = 10557636049152.

The previous prime is 21115321425091. The next prime is 21115321425137. The reversal of 21115321425136 is 63152412351112.

It is a junction number, because it is equal to n+sod(n) for n = 21115321425095 and 21115321425104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115321425137) 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 3 ways as a sum of consecutive naturals, for example, 6933745 + ... + 9503023.

It is an arithmetic number, because the mean of its divisors is an integer number (2045551541600).

Almost surely, 2^{21115321425136} is an apocalyptic number.

It is an amenable number.

21115321425136 is a deficient number, since it is larger than the sum of its proper divisors (19795709406864).

21115321425136 is a wasteful number, since it uses less digits than its factorization.

21115321425136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082936 (or 3082930 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

Adding to 21115321425136 its reverse (63152412351112), we get a palindrome (84267733776248).

The spelling of 21115321425136 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-one million, four hundred twenty-five thousand, one hundred thirty-six".