21905119170 has 80 divisors (see below), whose sum is σ = 64255042368. Its totient is φ = 5310329760.

The previous prime is 21905119163. The next prime is 21905119189. The reversal of 21905119170 is 7191150912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1220334 + ... + 1238153.

Almost surely, 2^21905119170 is an apocalyptic number.

21905119170 is an abundant number, since it is smaller than the sum of its proper divisors (42349923198).

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

21905119170 is a wasteful number, since it uses less digits than its factorization.

21905119170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458517 (or 2458508 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 36.

The spelling of 21905119170 in words is "twenty-one billion, nine hundred five million, one hundred nineteen thousand, one hundred seventy".