21555330109488 has 240 divisors, whose sum is σ = 72065694792000. Its totient is φ = 6008453821440.

The previous prime is 21555330109477. The next prime is 21555330109507. The reversal of 21555330109488 is 88490103355512.

21555330109488 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 53 + 3 + 0 + 109 + 488 = 666.

It is a super-2 number, since 2×21555330109488² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3297043 + ... + 7347186.

It is an arithmetic number, because the mean of its divisors is an integer number (300273728300).

Almost surely, 2^{21555330109488} is an apocalyptic number.

21555330109488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21555330109488 is an abundant number, since it is smaller than the sum of its proper divisors (50510364682512).

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

21555330109488 is a wasteful number, since it uses less digits than its factorization.

21555330109488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10644305 (or 10644282 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 54.

The spelling of 21555330109488 in words is "twenty-one trillion, five hundred fifty-five billion, three hundred thirty million, one hundred nine thousand, four hundred eighty-eight".