21655236610160 has 40 divisors (see below), whose sum is σ = 50818971167856. Its totient is φ = 8581140485120.

The previous prime is 21655236610157. The next prime is 21655236610207. The reversal of 21655236610160 is 6101663255612.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1264900121 + ... + 1264917240.

Almost surely, 2^{21655236610160} is an apocalyptic number.

21655236610160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21655236610160 is an abundant number, since it is smaller than the sum of its proper divisors (29163734557696).

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

21655236610160 is a wasteful number, since it uses less digits than its factorization.

21655236610160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529817481 (or 2529817475 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

Adding to 21655236610160 its reverse (6101663255612), we get a palindrome (27756899865772).

The spelling of 21655236610160 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred thirty-six million, six hundred ten thousand, one hundred sixty".