21663536120136 has 48 divisors (see below), whose sum is σ = 59134061875200. Its totient is φ = 7164319028832.

The previous prime is 21663536120123. The next prime is 21663536120173. The reversal of 21663536120136 is 63102163536612.

21663536120136 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 353 + 61 + 201 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21663536120091 and 21663536120100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1184567416 + ... + 1184585703.

It is an arithmetic number, because the mean of its divisors is an integer number (1231959622400).

Almost surely, 2^{21663536120136} is an apocalyptic number.

It is an amenable number.

21663536120136 is an abundant number, since it is smaller than the sum of its proper divisors (37470525755064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21663536120136 is a wasteful number, since it uses less digits than its factorization.

21663536120136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369153258 (or 2369153251 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

Adding to 21663536120136 its reverse (63102163536612), we get a palindrome (84765699656748).

The spelling of 21663536120136 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred thirty-six million, one hundred twenty thousand, one hundred thirty-six".