21855734071908 has 96 divisors (see below), whose sum is σ = 55721457189888. Its totient is φ = 6612398582400.

The previous prime is 21855734071837. The next prime is 21855734071937. The reversal of 21855734071908 is 80917043755812.

It is a super-2 number, since 2×21855734071908² (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 31 ways as a sum of consecutive naturals, for example, 309023766 + ... + 309094482.

It is an arithmetic number, because the mean of its divisors is an integer number (580431845728).

Almost surely, 2^{21855734071908} is an apocalyptic number.

It is an amenable number.

21855734071908 is an abundant number, since it is smaller than the sum of its proper divisors (33865723117980).

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

21855734071908 is a wasteful number, since it uses less digits than its factorization.

21855734071908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74433 (or 74431 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 60.

The spelling of 21855734071908 in words is "twenty-one trillion, eight hundred fifty-five billion, seven hundred thirty-four million, seventy-one thousand, nine hundred eight".