21908419555560 has 32 divisors (see below), whose sum is σ = 65725258667040. Its totient is φ = 5842245214784.

The previous prime is 21908419555559. The next prime is 21908419555567. The reversal of 21908419555560 is 6555591480912.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 21908419555494 and 21908419555503.

It is not an unprimeable number, because it can be changed into a prime (21908419555567) 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 7 ways as a sum of consecutive naturals, for example, 91285081362 + ... + 91285081601.

It is an arithmetic number, because the mean of its divisors is an integer number (2053914333345).

Almost surely, 2^{21908419555560} is an apocalyptic number.

21908419555560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21908419555560 is an abundant number, since it is smaller than the sum of its proper divisors (43816839111480).

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

21908419555560 is a wasteful number, since it uses less digits than its factorization.

21908419555560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182570162977 (or 182570162973 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 60.

The spelling of 21908419555560 in words is "twenty-one trillion, nine hundred eight billion, four hundred nineteen million, five hundred fifty-five thousand, five hundred sixty".